951831 divided by 21 
We want to figure out the number of times 951831 can be divided by 21.

Advancing to step 1:
21 goes into 9 0 times with a remainder of 9.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 9 after subtracting 0 from 9.
Take the next digit (5) from the dividend and append it to 9, then repeat: 95 / 21

Advancing to step 2:
If we divide 95 by 21, we get 4 and a remainder of 11.
Write down 4 as next digit of the result. 
Result so far: 4.0
If we take 84 away from 95, we end up with 11.
Bring next digit (1) of the dividend behind the 11 and repeat the process: 111 / 21

Let's proceed to step 3:
When dividing 111 by 21, we get 5 with a remainder of 6.
Record the quotient 5 as the next digit in the result. 
Result so far: 45.0
Deduct 105 from 111 and we're left with 6.
Take the next digit (8) from the dividend and append it to 6, then repeat: 68 / 21

Step 4:
If we divide 68 by 21, we get 3 and a remainder of 5.
Put 3 as the next digit of the answer. 
Result so far: 453.0
If we take 63 away from 68, we end up with 5.
Fetch the next digit (3) from the dividend, attach it to 5 and continue: 53 / 21

Step 5:
If we divide 53 by 21, we get 2 and a remainder of 11.
Put 2 as the next digit of the answer. 
Result so far: 4532.0
Subtracting 42 from 53 leaves us with 11.
Grab the next digit (1) from the dividend, add it to 11, then carry on: 111 / 21

Advancing to step 6:
111 divided by 21 is 5 with a remainder of 6.
The number 5 becomes the next digit in our result. 
Result so far: 45325.0
The remainder is 6 after subtracting 105 from 111.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

On to step 7:
If we divide 60 by 21, we get 2 and a remainder of 18.
The next digit of our result is 2. 
Result so far: 45325.2
Subtract 42 from 60 to get 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Moving on to step 8:
The number 21 fits into 180 8 times, leaving a remainder of 12.
Record the quotient 8 as the next digit in the result. 
Result so far: 45325.28
Subtract 168 from 180 to get 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

On to step 9:
21 can be fit into 120 5 times, resulting in a remainder of 15.
Put 5 as the next digit of the answer. 
Result so far: 45325.285
The remainder is 15 after subtracting 105 from 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

On to step 10:
The number 21 fits into 150 7 times, leaving a remainder of 3.
Record the quotient 7 as the next digit in the result. 
Result so far: 45325.2857
The remainder is 3 after subtracting 147 from 150.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

On to step 11:
If we divide 30 by 21, we get 1 and a remainder of 9.
Record the quotient 1 as the next digit in the result. 
Result so far: 45325.28571
If we take 21 away from 30, we end up with 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Step 12:
If we divide 90 by 21, we get 4 and a remainder of 6.
Write down 4 as next digit of the result. 
Result so far: 45325.285714
Deduct 84 from 90 and we're left with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Advancing to step 13:
21 can be fit into 60 2 times, resulting in a remainder of 18.
Record the quotient 2 as the next digit in the result. 
Result so far: 45325.2857142
Deduct 42 from 60 and we're left with 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Going ahead to step 14:
21 can be fit into 180 8 times, resulting in a remainder of 12.
Record the quotient 8 as the next digit in the result. 
Result so far: 45325.28571428
If we take 168 away from 180, we end up with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

The final outcome is 45325.28571428, with a leftover of 1.2e-08.