We divide 817665 by 21
We're looking to find how many times 21 goes into 817665.

Let's proceed to step 1:
If we divide 8 by 21, we get 0 and a remainder of 8.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 8 and we're left with 8.
Append the next digit (1) from the dividend to 8 and continue with: 81 / 21

On to step 2:
21 can be fit into 81 3 times, resulting in a remainder of 18.
Put 3 as the next digit of the answer. 
Result so far: 3.0
The remainder is 18 after subtracting 63 from 81.
Fetch the next digit (7) from the dividend, attach it to 18 and continue: 187 / 21

On to step 3:
21 can be fit into 187 8 times, resulting in a remainder of 19.
Record the quotient 8 as the next digit in the result. 
Result so far: 38.0
Subtracting 168 from 187 leaves us with 19.
Include the next digit (6) from the dividend after 19, then repeat: 196 / 21

On to step 4:
The number 21 fits into 196 9 times, leaving a remainder of 7.
The next digit of our result is 9. 
Result so far: 389.0
Subtract 189 from 196 to get 7.
Append the next digit (6) from the dividend to 7 and continue with: 76 / 21

Going ahead to step 5:
When dividing 76 by 21, we get 3 with a remainder of 13.
The number 3 becomes the next digit in our result. 
Result so far: 3893.0
Subtract 63 from 76 to get 13.
Take the next digit (5) from the dividend and append it to 13, then repeat: 135 / 21

Let's proceed to step 6:
If we divide 135 by 21, we get 6 and a remainder of 9.
Record the quotient 6 as the next digit in the result. 
Result so far: 38936.0
If we subtract 126 from 135, 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.

On to step 7:
The number 21 fits into 90 4 times, leaving a remainder of 6.
Put 4 as the next digit of the answer. 
Result so far: 38936.4
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.

On to step 8:
The number 21 fits into 60 2 times, leaving a remainder of 18.
Write down 2 as next digit of the result. 
Result so far: 38936.42
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.

Let's proceed to step 9:
If we divide 180 by 21, we get 8 and a remainder of 12.
Write down 8 as next digit of the result. 
Result so far: 38936.428
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 10:
120 divided by 21 is 5 with a remainder of 15.
Write down 5 as next digit of the result. 
Result so far: 38936.4285
Subtracting 105 from 120 leaves us with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Let's proceed to step 11:
150 divided by 21 is 7 with a remainder of 3.
The number 7 becomes the next digit in our result. 
Result so far: 38936.42857
Subtracting 147 from 150 leaves us with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Moving on to step 12:
21 can be fit into 30 1 times, resulting in a remainder of 9.
Put 1 as the next digit of the answer. 
Result so far: 38936.428571
The remainder is 9 after subtracting 21 from 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Advancing to step 13:
If we divide 90 by 21, we get 4 and a remainder of 6.
Use 4 as the next digit of our solution. 
Result so far: 38936.4285714
If we subtract 84 from 90, 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.

Step 14:
The number 21 fits into 60 2 times, leaving a remainder of 18.
Write down 2 as next digit of the result. 
Result so far: 38936.42857142
If we subtract 42 from 60, we 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.

The final outcome is 38936.42857142, with a leftover of 1.8e-08.