We're dividing 836016 by 21 
We want to figure out the number of times 836016 can be divided by 21.

On to step 1:
21 goes into 8 0 times with a remainder of 8.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 8 leaves us with 8.
Append the next digit (3) from the dividend to 8 and continue with: 83 / 21

Going ahead to step 2:
21 goes into 83 3 times with a remainder of 20.
Use 3 as the next digit of our solution. 
Result so far: 3.0
If we take 63 away from 83, we end up with 20.
Grab the next digit (6) from the dividend, add it to 20, then carry on: 206 / 21

Step 3:
When dividing 206 by 21, we get 9 with a remainder of 17.
Use 9 as the next digit of our solution. 
Result so far: 39.0
Subtract 189 from 206 to get 17.
Include the next digit (0) from the dividend after 17, then repeat: 170 / 21

Advancing to step 4:
When dividing 170 by 21, we get 8 with a remainder of 2.
The next digit of our result is 8. 
Result so far: 398.0
If we subtract 168 from 170, we get 2.
Fetch the next digit (1) from the dividend, attach it to 2 and continue: 21 / 21

Let's proceed to step 5:
21 can be fit into 21 1 times, resulting in a remainder of 0.
The number 1 becomes the next digit in our result. 
Result so far: 3981.0
Subtract 21 from 21 to get 0.
Grab the next digit (6) from the dividend, add it to 0, then carry on: 6 / 21

Advancing to step 6:
If we divide 6 by 21, we get 0 and a remainder of 6.
Write down 0 as next digit of the result. 
Result so far: 39810.0
Deduct 0 from 6 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.

Going ahead to step 7:
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: 39810.2
The remainder is 18 after subtracting 42 from 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Let's proceed to step 8:
The number 21 fits into 180 8 times, leaving a remainder of 12.
Put 8 as the next digit of the answer. 
Result so far: 39810.28
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.

Moving on to step 9:
21 goes into 120 5 times with a remainder of 15.
Use 5 as the next digit of our solution. 
Result so far: 39810.285
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.

Moving on to step 10:
If we divide 150 by 21, we get 7 and a remainder of 3.
Use 7 as the next digit of our solution. 
Result so far: 39810.2857
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.

Step 11:
21 goes into 30 1 times with a remainder of 9.
The next digit of our result is 1. 
Result so far: 39810.28571
If we subtract 21 from 30, we 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.

Step 12:
The number 21 fits into 90 4 times, leaving a remainder of 6.
Use 4 as the next digit of our solution. 
Result so far: 39810.285714
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.

Advancing to step 13:
The number 21 fits into 60 2 times, leaving a remainder of 18.
Put 2 as the next digit of the answer. 
Result so far: 39810.2857142
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.

Moving on to step 14:
When dividing 180 by 21, we get 8 with a remainder of 12.
Use 8 as the next digit of our solution. 
Result so far: 39810.28571428
Deduct 168 from 180 and we're left 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.

In conclusion, the division gives 39810.28571428 with a balance of 1.2e-08.