539215 divided by 21 
We want to figure out the number of times 539215 can be divided by 21.

Moving on to step 1:
21 can be fit into 5 0 times, resulting in a remainder of 5.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 5, we end up with 5.
Take the next digit (3) from the dividend and append it to 5, then repeat: 53 / 21

Advancing to step 2:
The number 21 fits into 53 2 times, leaving a remainder of 11.
The number 2 becomes the next digit in our result. 
Result so far: 2.0
Subtracting 42 from 53 leaves us with 11.
Bring next digit (9) of the dividend behind the 11 and repeat the process: 119 / 21

Going ahead to step 3:
If we divide 119 by 21, we get 5 and a remainder of 14.
Record the quotient 5 as the next digit in the result. 
Result so far: 25.0
Deduct 105 from 119 and we're left with 14.
Include the next digit (2) from the dividend after 14, then repeat: 142 / 21

Step 4:
If we divide 142 by 21, we get 6 and a remainder of 16.
Use 6 as the next digit of our solution. 
Result so far: 256.0
Subtracting 126 from 142 leaves us with 16.
Fetch the next digit (1) from the dividend, attach it to 16 and continue: 161 / 21

Going ahead to step 5:
21 goes into 161 7 times with a remainder of 14.
Write down 7 as next digit of the result. 
Result so far: 2567.0
Subtract 147 from 161 to get 14.
Append the next digit (5) from the dividend to 14 and continue with: 145 / 21

On to step 6:
21 can be fit into 145 6 times, resulting in a remainder of 19.
The next digit of our result is 6. 
Result so far: 25676.0
If we take 126 away from 145, we end up with 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

On to step 7:
21 goes into 190 9 times with a remainder of 1.
Write down 9 as next digit of the result. 
Result so far: 25676.9
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 8:
21 can be fit into 10 0 times, resulting in a remainder of 10.
The number 0 becomes the next digit in our result. 
Result so far: 25676.9
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 9:
21 goes into 100 4 times with a remainder of 16.
Write down 4 as next digit of the result. 
Result so far: 25676.904
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.

Advancing to step 10:
160 divided by 21 is 7 with a remainder of 13.
Write down 7 as next digit of the result. 
Result so far: 25676.9047
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.

Going ahead to step 11:
21 goes into 130 6 times with a remainder of 4.
Put 6 as the next digit of the answer. 
Result so far: 25676.90476
Subtracting 126 from 130 leaves us with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

On to step 12:
21 can be fit into 40 1 times, resulting in a remainder of 19.
Write down 1 as next digit of the result. 
Result so far: 25676.904761
Subtracting 21 from 40 leaves us with 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

On to step 13:
If we divide 190 by 21, we get 9 and a remainder of 1.
Use 9 as the next digit of our solution. 
Result so far: 25676.9047619
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.

Moving on to step 14:
If we divide 10 by 21, we get 0 and a remainder of 10.
Put 0 as the next digit of the answer. 
Result so far: 25676.9047619
The remainder is 10 after subtracting 0 from 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

The final outcome is 25676.9047619, with a leftover of 1e-08.