578624 divided by 21 
We want to divide 578624 by 21.

Moving on to step 1:
5 divided by 21 is 0 with a remainder of 5.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 5 and we're left with 5.
Bring next digit (7) of the dividend behind the 5 and repeat the process: 57 / 21

Going ahead to step 2:
The number 21 fits into 57 2 times, leaving a remainder of 15.
Use 2 as the next digit of our solution. 
Result so far: 2.0
If we subtract 42 from 57, we get 15.
Bring next digit (8) of the dividend behind the 15 and repeat the process: 158 / 21

Going ahead to step 3:
21 goes into 158 7 times with a remainder of 11.
Use 7 as the next digit of our solution. 
Result so far: 27.0
Subtract 147 from 158 to get 11.
Fetch the next digit (6) from the dividend, attach it to 11 and continue: 116 / 21

Moving on to step 4:
21 can be fit into 116 5 times, resulting in a remainder of 11.
The number 5 becomes the next digit in our result. 
Result so far: 275.0
If we subtract 105 from 116, we get 11.
Bring next digit (2) of the dividend behind the 11 and repeat the process: 112 / 21

Let's proceed to step 5:
The number 21 fits into 112 5 times, leaving a remainder of 7.
The next digit of our result is 5. 
Result so far: 2755.0
Deduct 105 from 112 and we're left with 7.
Append the next digit (4) from the dividend to 7 and continue with: 74 / 21

Let's proceed to step 6:
21 goes into 74 3 times with a remainder of 11.
Write down 3 as next digit of the result. 
Result so far: 27553.0
Deduct 63 from 74 and we're left with 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 7:
21 can be fit into 110 5 times, resulting in a remainder of 5.
The number 5 becomes the next digit in our result. 
Result so far: 27553.5
Subtracting 105 from 110 leaves us with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

On to step 8:
When dividing 50 by 21, we get 2 with a remainder of 8.
The number 2 becomes the next digit in our result. 
Result so far: 27553.52
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.

On to step 9:
If we divide 80 by 21, we get 3 and a remainder of 17.
Put 3 as the next digit of the answer. 
Result so far: 27553.523
Deduct 63 from 80 and we're left 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.

Going ahead to step 10:
170 divided by 21 is 8 with a remainder of 2.
Write down 8 as next digit of the result. 
Result so far: 27553.5238
If we subtract 168 from 170, we 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.

Step 11:
21 can be fit into 20 0 times, resulting in a remainder of 20.
Write down 0 as next digit of the result. 
Result so far: 27553.5238
Deduct 0 from 20 and we're left 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.

Going ahead to step 12:
When dividing 200 by 21, we get 9 with a remainder of 11.
Write down 9 as next digit of the result. 
Result so far: 27553.523809
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 13:
The number 21 fits into 110 5 times, leaving a remainder of 5.
Write down 5 as next digit of the result. 
Result so far: 27553.5238095
Subtract 105 from 110 to get 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Step 14:
The number 21 fits into 50 2 times, leaving a remainder of 8.
Use 2 as the next digit of our solution. 
Result so far: 27553.52380952
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.

The final outcome is 27553.52380952, with a leftover of 8e-09.