587855 divided by 21 
We want to figure out the number of times 587855 can be divided by 21.

Moving on to step 1:
21 goes into 5 0 times with a remainder of 5.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 5 to get 5.
Fetch the next digit (8) from the dividend, attach it to 5 and continue: 58 / 21

Moving on to step 2:
When dividing 58 by 21, we get 2 with a remainder of 16.
Put 2 as the next digit of the answer. 
Result so far: 2.0
Deduct 42 from 58 and we're left with 16.
Include the next digit (7) from the dividend after 16, then repeat: 167 / 21

Going ahead to step 3:
21 can be fit into 167 7 times, resulting in a remainder of 20.
Use 7 as the next digit of our solution. 
Result so far: 27.0
Subtracting 147 from 167 leaves us with 20.
Bring next digit (8) of the dividend behind the 20 and repeat the process: 208 / 21

Let's proceed to step 4:
When dividing 208 by 21, we get 9 with a remainder of 19.
Record the quotient 9 as the next digit in the result. 
Result so far: 279.0
Subtracting 189 from 208 leaves us with 19.
Fetch the next digit (5) from the dividend, attach it to 19 and continue: 195 / 21

On to step 5:
195 divided by 21 is 9 with a remainder of 6.
Use 9 as the next digit of our solution. 
Result so far: 2799.0
If we subtract 189 from 195, we get 6.
Take the next digit (5) from the dividend and append it to 6, then repeat: 65 / 21

Moving on to step 6:
21 goes into 65 3 times with a remainder of 2.
The next digit of our result is 3. 
Result so far: 27993.0
Deduct 63 from 65 and we're left 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.

Step 7:
When dividing 20 by 21, we get 0 with a remainder of 20.
The number 0 becomes the next digit in our result. 
Result so far: 27993.0
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 8:
200 divided by 21 is 9 with a remainder of 11.
The number 9 becomes the next digit in our result. 
Result so far: 27993.09
Subtracting 189 from 200 leaves us 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.

Moving on to step 9:
21 goes into 110 5 times with a remainder of 5.
The number 5 becomes the next digit in our result. 
Result so far: 27993.095
If we take 105 away from 110, we end up 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.

Let's proceed to step 10:
The number 21 fits into 50 2 times, leaving a remainder of 8.
Write down 2 as next digit of the result. 
Result so far: 27993.0952
If we subtract 42 from 50, we get 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 11:
The number 21 fits into 80 3 times, leaving a remainder of 17.
Record the quotient 3 as the next digit in the result. 
Result so far: 27993.09523
The remainder is 17 after subtracting 63 from 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Moving on to step 12:
When dividing 170 by 21, we get 8 with a remainder of 2.
The number 8 becomes the next digit in our result. 
Result so far: 27993.095238
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.

Going ahead 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: 27993.095238
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:
21 goes into 200 9 times with a remainder of 11.
Write down 9 as next digit of the result. 
Result so far: 27993.09523809
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 quotient of the division is 27993.09523809, and the remainder is 1.1e-08.