12856832 divided by 21 
We want to figure out the number of times 12856832 can be divided by 21.

Going ahead to step 1:
The number 21 fits into 1 0 times, leaving a remainder of 1.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 1, we get 1.
Include the next digit (2) from the dividend after 1, then repeat: 12 / 21

Going ahead to step 2:
21 can be fit into 12 0 times, resulting in a remainder of 12.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 12 and we're left with 12.
Take the next digit (8) from the dividend and append it to 12, then repeat: 128 / 21

On to step 3:
128 divided by 21 is 6 with a remainder of 2.
Use 6 as the next digit of our solution. 
Result so far: 6.0
The remainder is 2 after subtracting 126 from 128.
Fetch the next digit (5) from the dividend, attach it to 2 and continue: 25 / 21

Advancing to step 4:
25 divided by 21 is 1 with a remainder of 4.
The next digit of our result is 1. 
Result so far: 61.0
If we subtract 21 from 25, we get 4.
Include the next digit (6) from the dividend after 4, then repeat: 46 / 21

Going ahead to step 5:
21 can be fit into 46 2 times, resulting in a remainder of 4.
Record the quotient 2 as the next digit in the result. 
Result so far: 612.0
The remainder is 4 after subtracting 42 from 46.
Include the next digit (8) from the dividend after 4, then repeat: 48 / 21

On to step 6:
21 can be fit into 48 2 times, resulting in a remainder of 6.
Use 2 as the next digit of our solution. 
Result so far: 6122.0
The remainder is 6 after subtracting 42 from 48.
Append the next digit (3) from the dividend to 6 and continue with: 63 / 21

Advancing to step 7:
When dividing 63 by 21, we get 3 with a remainder of 0.
The next digit of our result is 3. 
Result so far: 61223.0
If we take 63 away from 63, we end up with 0.
Bring next digit (2) of the dividend behind the 0 and repeat the process: 2 / 21

Going ahead to step 8:
21 goes into 2 0 times with a remainder of 2.
Write down 0 as next digit of the result. 
Result so far: 612230.0
If we take 0 away from 2, we end up with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Advancing to step 9:
20 divided by 21 is 0 with a remainder of 20.
Use 0 as the next digit of our solution. 
Result so far: 612230.0
The remainder is 20 after subtracting 0 from 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

On to step 10:
If we divide 200 by 21, we get 9 and a remainder of 11.
Record the quotient 9 as the next digit in the result. 
Result so far: 612230.09
The remainder is 11 after subtracting 189 from 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Advancing to step 11:
When dividing 110 by 21, we get 5 with a remainder of 5.
Use 5 as the next digit of our solution. 
Result so far: 612230.095
If we subtract 105 from 110, we get 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Advancing to step 12:
21 goes into 50 2 times with a remainder of 8.
Record the quotient 2 as the next digit in the result. 
Result so far: 612230.0952
Subtract 42 from 50 to get 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Let's proceed to step 13:
80 divided by 21 is 3 with a remainder of 17.
Use 3 as the next digit of our solution. 
Result so far: 612230.09523
The remainder is 17 after subtracting 63 from 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Let's proceed to step 14:
If we divide 170 by 21, we get 8 and a remainder of 2.
Write down 8 as next digit of the result. 
Result so far: 612230.095238
If we subtract 168 from 170, we get 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

On to step 15:
20 divided by 21 is 0 with a remainder of 20.
Put 0 as the next digit of the answer. 
Result so far: 612230.095238
The remainder is 20 after subtracting 0 from 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Going ahead to step 16:
When dividing 200 by 21, we get 9 with a remainder of 11.
Use 9 as the next digit of our solution. 
Result so far: 612230.09523809
If we subtract 189 from 200, we get 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

After the division, we end up with 612230.09523809 and a remainder of 1.1e-08.