836331 ÷ 21 
We want to figure out the number of times 836331 can be divided by 21.

Let's proceed to step 1:
21 goes into 8 0 times with a remainder of 8.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 8, we get 8.
Bring next digit (3) of the dividend behind the 8 and repeat the process: 83 / 21

Step 2:
21 goes into 83 3 times with a remainder of 20.
The number 3 becomes the next digit in our result. 
Result so far: 3.0
Subtract 63 from 83 to get 20.
Include the next digit (6) from the dividend after 20, then repeat: 206 / 21

Step 3:
21 goes into 206 9 times with a remainder of 17.
Write down 9 as next digit of the result. 
Result so far: 39.0
Subtracting 189 from 206 leaves us with 17.
Append the next digit (3) from the dividend to 17 and continue with: 173 / 21

Going ahead to step 4:
When dividing 173 by 21, we get 8 with a remainder of 5.
Write down 8 as next digit of the result. 
Result so far: 398.0
Subtracting 168 from 173 leaves us with 5.
Fetch the next digit (3) from the dividend, attach it to 5 and continue: 53 / 21

Moving on to step 5:
21 can be fit into 53 2 times, resulting in a remainder of 11.
Use 2 as the next digit of our solution. 
Result so far: 3982.0
The remainder is 11 after subtracting 42 from 53.
Take the next digit (1) from the dividend and append it to 11, then repeat: 111 / 21

Advancing to step 6:
111 divided by 21 is 5 with a remainder of 6.
Write down 5 as next digit of the result. 
Result so far: 39825.0
If we subtract 105 from 111, we get 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Moving on to step 7:
21 can be fit into 60 2 times, resulting in a remainder of 18.
The number 2 becomes the next digit in our result. 
Result so far: 39825.2
Subtracting 42 from 60 leaves us 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.

On to step 8:
21 can be fit into 180 8 times, resulting in a remainder of 12.
Use 8 as the next digit of our solution. 
Result so far: 39825.28
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.

Going ahead to step 9:
120 divided by 21 is 5 with a remainder of 15.
Use 5 as the next digit of our solution. 
Result so far: 39825.285
If we subtract 105 from 120, we get 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Step 10:
When dividing 150 by 21, we get 7 with a remainder of 3.
The number 7 becomes the next digit in our result. 
Result so far: 39825.2857
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.

Advancing 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: 39825.28571
Subtract 21 from 30 to get 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

On to step 12:
21 can be fit into 90 4 times, resulting in a remainder of 6.
Write down 4 as next digit of the result. 
Result so far: 39825.285714
The remainder is 6 after subtracting 84 from 90.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Going ahead to step 13:
If we divide 60 by 21, we get 2 and a remainder of 18.
The number 2 becomes the next digit in our result. 
Result so far: 39825.2857142
Subtracting 42 from 60 leaves us 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.

Moving on to step 14:
If we divide 180 by 21, we get 8 and a remainder of 12.
The number 8 becomes the next digit in our result. 
Result so far: 39825.28571428
Subtracting 168 from 180 leaves us 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 result is 39825.28571428 with a remainder of 1.2e-08.