We look at the division of 586363 by 21 
We want to figure out the number of times 586363 can be divided by 21.

Let's proceed to step 1:
When dividing 5 by 21, we get 0 with a remainder of 5.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 5 to get 5.
Include the next digit (8) from the dividend after 5, then repeat: 58 / 21

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
If we subtract 42 from 58, we get 16.
Append the next digit (6) from the dividend to 16 and continue with: 166 / 21

Advancing to step 3:
21 can be fit into 166 7 times, resulting in a remainder of 19.
Put 7 as the next digit of the answer. 
Result so far: 27.0
If we subtract 147 from 166, we get 19.
Fetch the next digit (3) from the dividend, attach it to 19 and continue: 193 / 21

Step 4:
When dividing 193 by 21, we get 9 with a remainder of 4.
Use 9 as the next digit of our solution. 
Result so far: 279.0
If we subtract 189 from 193, we get 4.
Include the next digit (6) from the dividend after 4, then repeat: 46 / 21

Step 5:
21 can be fit into 46 2 times, resulting in a remainder of 4.
The number 2 becomes the next digit in our result. 
Result so far: 2792.0
Deduct 42 from 46 and we're left with 4.
Grab the next digit (3) from the dividend, add it to 4, then carry on: 43 / 21

On to step 6:
When dividing 43 by 21, we get 2 with a remainder of 1.
The next digit of our result is 2. 
Result so far: 27922.0
If we subtract 42 from 43, we get 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

On to step 7:
21 goes into 10 0 times with a remainder of 10.
Record the quotient 0 as the next digit in the result. 
Result so far: 27922.0
If we subtract 0 from 10, we get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Going ahead to step 8:
The number 21 fits into 100 4 times, leaving a remainder of 16.
Put 4 as the next digit of the answer. 
Result so far: 27922.04
Subtracting 84 from 100 leaves us with 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Step 9:
When dividing 160 by 21, we get 7 with a remainder of 13.
The number 7 becomes the next digit in our result. 
Result so far: 27922.047
Deduct 147 from 160 and we're left with 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

Let's proceed to step 10:
If we divide 130 by 21, we get 6 and a remainder of 4.
The number 6 becomes the next digit in our result. 
Result so far: 27922.0476
The remainder is 4 after subtracting 126 from 130.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Going ahead to step 11:
40 divided by 21 is 1 with a remainder of 19.
Record the quotient 1 as the next digit in the result. 
Result so far: 27922.04761
The remainder is 19 after subtracting 21 from 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Going ahead to step 12:
When dividing 190 by 21, we get 9 with a remainder of 1.
The number 9 becomes the next digit in our result. 
Result so far: 27922.047619
The remainder is 1 after subtracting 189 from 190.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Step 13:
10 divided by 21 is 0 with a remainder of 10.
Use 0 as the next digit of our solution. 
Result so far: 27922.047619
If we take 0 away from 10, we end up with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Step 14:
100 divided by 21 is 4 with a remainder of 16.
Record the quotient 4 as the next digit in the result. 
Result so far: 27922.04761904
If we subtract 84 from 100, we get 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Our division results in 27922.04761904 with a remaining 1.6e-08.