We look at the division of 21721989 by 812 
Let's see how many times 812 fits into 21721989.

On to step 1:
The number 812 fits into 2 0 times, leaving a remainder of 2.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 2, we get 2.
Grab the next digit (1) from the dividend, add it to 2, then carry on: 21 / 812

Step 2:
When dividing 21 by 812, we get 0 with a remainder of 21.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 21, we get 21.
Grab the next digit (7) from the dividend, add it to 21, then carry on: 217 / 812

Going ahead to step 3:
If we divide 217 by 812, we get 0 and a remainder of 217.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 217 leaves us with 217.
Bring next digit (2) of the dividend behind the 217 and repeat the process: 2172 / 812

Going ahead to step 4:
812 can be fit into 2172 2 times, resulting in a remainder of 548.
Record the quotient 2 as the next digit in the result. 
Result so far: 2.0
If we take 1624 away from 2172, we end up with 548.
Bring next digit (1) of the dividend behind the 548 and repeat the process: 5481 / 812

On to step 5:
812 can be fit into 5481 6 times, resulting in a remainder of 609.
Write down 6 as next digit of the result. 
Result so far: 26.0
Subtract 4872 from 5481 to get 609.
Append the next digit (9) from the dividend to 609 and continue with: 6099 / 812

Advancing to step 6:
812 goes into 6099 7 times with a remainder of 415.
The number 7 becomes the next digit in our result. 
Result so far: 267.0
The remainder is 415 after subtracting 5684 from 6099.
Grab the next digit (8) from the dividend, add it to 415, then carry on: 4158 / 812

Advancing to step 7:
The number 812 fits into 4158 5 times, leaving a remainder of 98.
Record the quotient 5 as the next digit in the result. 
Result so far: 2675.0
The remainder is 98 after subtracting 4060 from 4158.
Bring next digit (9) of the dividend behind the 98 and repeat the process: 989 / 812

Advancing to step 8:
812 goes into 989 1 times with a remainder of 177.
Record the quotient 1 as the next digit in the result. 
Result so far: 26751.0
Deduct 812 from 989 and we're left with 177.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1770, and continue the process.

Step 9:
812 can be fit into 1770 2 times, resulting in a remainder of 146.
Put 2 as the next digit of the answer. 
Result so far: 26751.2
Subtract 1624 from 1770 to get 146.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1460, and continue the process.

Let's proceed to step 10:
If we divide 1460 by 812, we get 1 and a remainder of 648.
The next digit of our result is 1. 
Result so far: 26751.21
If we subtract 812 from 1460, we get 648.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6480, and continue the process.

On to step 11:
When dividing 6480 by 812, we get 7 with a remainder of 796.
Use 7 as the next digit of our solution. 
Result so far: 26751.217
The remainder is 796 after subtracting 5684 from 6480.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7960, and continue the process.

Advancing to step 12:
812 can be fit into 7960 9 times, resulting in a remainder of 652.
Put 9 as the next digit of the answer. 
Result so far: 26751.2179
Subtracting 7308 from 7960 leaves us with 652.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6520, and continue the process.

Step 13:
812 can be fit into 6520 8 times, resulting in a remainder of 24.
The number 8 becomes the next digit in our result. 
Result so far: 26751.21798
If we subtract 6496 from 6520, we get 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

Moving on to step 14:
240 divided by 812 is 0 with a remainder of 240.
Use 0 as the next digit of our solution. 
Result so far: 26751.21798
Subtract 0 from 240 to get 240.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2400, and continue the process.

Let's proceed to step 15:
The number 812 fits into 2400 2 times, leaving a remainder of 776.
Write down 2 as next digit of the result. 
Result so far: 26751.2179802
Subtracting 1624 from 2400 leaves us with 776.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7760, and continue the process.

Moving on to step 16:
If we divide 7760 by 812, we get 9 and a remainder of 452.
Write down 9 as next digit of the result. 
Result so far: 26751.21798029
If we take 7308 away from 7760, we end up with 452.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4520, and continue the process.

In conclusion, the division gives 26751.21798029 with a balance of 4.52e-07.