517587 divided by 21 
Let's see how many times 21 fits into 517587.

Let's proceed to step 1:
21 can be fit into 5 0 times, resulting in a remainder of 5.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 5 to get 5.
Take the next digit (1) from the dividend and append it to 5, then repeat: 51 / 21

On to step 2:
21 goes into 51 2 times with a remainder of 9.
Use 2 as the next digit of our solution. 
Result so far: 2.0
If we subtract 42 from 51, we get 9.
Fetch the next digit (7) from the dividend, attach it to 9 and continue: 97 / 21

Moving on to step 3:
When dividing 97 by 21, we get 4 with a remainder of 13.
Write down 4 as next digit of the result. 
Result so far: 24.0
If we take 84 away from 97, we end up with 13.
Include the next digit (5) from the dividend after 13, then repeat: 135 / 21

Let's proceed to step 4:
If we divide 135 by 21, we get 6 and a remainder of 9.
The next digit of our result is 6. 
Result so far: 246.0
Subtracting 126 from 135 leaves us with 9.
Bring next digit (8) of the dividend behind the 9 and repeat the process: 98 / 21

Step 5:
21 can be fit into 98 4 times, resulting in a remainder of 14.
Put 4 as the next digit of the answer. 
Result so far: 2464.0
The remainder is 14 after subtracting 84 from 98.
Grab the next digit (7) from the dividend, add it to 14, then carry on: 147 / 21

On to step 6:
147 divided by 21 is 7 with a remainder of 0.
Put 7 as the next digit of the answer. 
Result so far: 24647.0
If we subtract 147 from 147, we get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Let's proceed to step 7:
When dividing 0 by 21, we get 0 with a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 24647.0
Subtracting 0 from 0 leaves us with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

On to step 8:
If we divide 0 by 21, we get 0 and a remainder of 0.
The next digit of our result is 0. 
Result so far: 24647.0
The remainder is 0 after subtracting 0 from 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

In conclusion, the division gives 24647.0 with a balance of 0.0.