813584 ÷ 21 
We want to divide 813584 by 21.

Moving on to step 1:
8 divided by 21 is 0 with a remainder of 8.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 8 after subtracting 0 from 8.
Fetch the next digit (1) from the dividend, attach it to 8 and continue: 81 / 21

Let's proceed to step 2:
The number 21 fits into 81 3 times, leaving a remainder of 18.
Use 3 as the next digit of our solution. 
Result so far: 3.0
Subtracting 63 from 81 leaves us with 18.
Append the next digit (3) from the dividend to 18 and continue with: 183 / 21

Step 3:
21 goes into 183 8 times with a remainder of 15.
Record the quotient 8 as the next digit in the result. 
Result so far: 38.0
The remainder is 15 after subtracting 168 from 183.
Append the next digit (5) from the dividend to 15 and continue with: 155 / 21

Going ahead to step 4:
21 goes into 155 7 times with a remainder of 8.
Record the quotient 7 as the next digit in the result. 
Result so far: 387.0
Deduct 147 from 155 and we're left with 8.
Bring next digit (8) of the dividend behind the 8 and repeat the process: 88 / 21

Step 5:
88 divided by 21 is 4 with a remainder of 4.
Use 4 as the next digit of our solution. 
Result so far: 3874.0
Subtract 84 from 88 to get 4.
Bring next digit (4) of the dividend behind the 4 and repeat the process: 44 / 21

On to step 6:
21 goes into 44 2 times with a remainder of 2.
Record the quotient 2 as the next digit in the result. 
Result so far: 38742.0
Subtracting 42 from 44 leaves us 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.

Going ahead to step 7:
20 divided by 21 is 0 with a remainder of 20.
Use 0 as the next digit of our solution. 
Result so far: 38742.0
Subtracting 0 from 20 leaves us with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Step 8:
200 divided by 21 is 9 with a remainder of 11.
Use 9 as the next digit of our solution. 
Result so far: 38742.09
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.

On to step 9:
If we divide 110 by 21, we get 5 and a remainder of 5.
Write down 5 as next digit of the result. 
Result so far: 38742.095
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.

Advancing to step 10:
21 can be fit into 50 2 times, resulting in a remainder of 8.
Put 2 as the next digit of the answer. 
Result so far: 38742.0952
Deduct 42 from 50 and we're left 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.

Advancing to step 11:
If we divide 80 by 21, we get 3 and a remainder of 17.
The next digit of our result is 3. 
Result so far: 38742.09523
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.

Let's proceed to step 12:
21 can be fit into 170 8 times, resulting in a remainder of 2.
Record the quotient 8 as the next digit in the result. 
Result so far: 38742.095238
Subtracting 168 from 170 leaves us 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.

Moving on to step 13:
The number 21 fits into 20 0 times, leaving a remainder of 20.
The number 0 becomes the next digit in our result. 
Result so far: 38742.095238
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.

Let's proceed to step 14:
The number 21 fits into 200 9 times, leaving a remainder of 11.
The next digit of our result is 9. 
Result so far: 38742.09523809
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.

The final outcome is 38742.09523809, with a leftover of 1.1e-08.