We divide 823187 by 21
We want to divide 823187 by 21.

Step 1:
21 can be fit into 8 0 times, resulting in a remainder of 8.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 8, we end up with 8.
Grab the next digit (2) from the dividend, add it to 8, then carry on: 82 / 21

Moving on to step 2:
If we divide 82 by 21, we get 3 and a remainder of 19.
Use 3 as the next digit of our solution. 
Result so far: 3.0
The remainder is 19 after subtracting 63 from 82.
Include the next digit (3) from the dividend after 19, then repeat: 193 / 21

Advancing to step 3:
21 goes into 193 9 times with a remainder of 4.
Record the quotient 9 as the next digit in the result. 
Result so far: 39.0
Subtract 189 from 193 to get 4.
Append the next digit (1) from the dividend to 4 and continue with: 41 / 21

Advancing to step 4:
41 divided by 21 is 1 with a remainder of 20.
Use 1 as the next digit of our solution. 
Result so far: 391.0
The remainder is 20 after subtracting 21 from 41.
Grab the next digit (8) from the dividend, add it to 20, then carry on: 208 / 21

Step 5:
If we divide 208 by 21, we get 9 and a remainder of 19.
The number 9 becomes the next digit in our result. 
Result so far: 3919.0
If we subtract 189 from 208, we get 19.
Take the next digit (7) from the dividend and append it to 19, then repeat: 197 / 21

Step 6:
When dividing 197 by 21, we get 9 with a remainder of 8.
Use 9 as the next digit of our solution. 
Result so far: 39199.0
The remainder is 8 after subtracting 189 from 197.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

On to step 7:
21 can be fit into 80 3 times, resulting in a remainder of 17.
Write down 3 as next digit of the result. 
Result so far: 39199.3
If we take 63 away from 80, we end up with 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

On to step 8:
When dividing 170 by 21, we get 8 with a remainder of 2.
The next digit of our result is 8. 
Result so far: 39199.38
Subtract 168 from 170 to 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.

Advancing to step 9:
If we divide 20 by 21, we get 0 and a remainder of 20.
The number 0 becomes the next digit in our result. 
Result so far: 39199.38
If we subtract 0 from 20, we get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Moving on to step 10:
The number 21 fits into 200 9 times, leaving a remainder of 11.
Use 9 as the next digit of our solution. 
Result so far: 39199.3809
Subtract 189 from 200 to 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.

Going ahead to step 11:
110 divided by 21 is 5 with a remainder of 5.
Put 5 as the next digit of the answer. 
Result so far: 39199.38095
The remainder is 5 after subtracting 105 from 110.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Going ahead to step 12:
When dividing 50 by 21, we get 2 with a remainder of 8.
Use 2 as the next digit of our solution. 
Result so far: 39199.380952
Subtracting 42 from 50 leaves us with 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:
When dividing 80 by 21, we get 3 with a remainder of 17.
Record the quotient 3 as the next digit in the result. 
Result so far: 39199.3809523
If we subtract 63 from 80, we get 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Going ahead to step 14:
21 goes into 170 8 times with a remainder of 2.
The next digit of our result is 8. 
Result so far: 39199.38095238
Subtract 168 from 170 to 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.

The final outcome is 39199.38095238, with a leftover of 2e-09.