We look at the division of 538605 by 21 
We want to figure out the number of times 538605 can be divided by 21.

Advancing to step 1:
When dividing 5 by 21, we get 0 with a remainder of 5.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 5, we get 5.
Fetch the next digit (3) from the dividend, attach it to 5 and continue: 53 / 21

Step 2:
21 can be fit into 53 2 times, resulting in a remainder of 11.
Put 2 as the next digit of the answer. 
Result so far: 2.0
The remainder is 11 after subtracting 42 from 53.
Bring next digit (8) of the dividend behind the 11 and repeat the process: 118 / 21

Step 3:
21 can be fit into 118 5 times, resulting in a remainder of 13.
The next digit of our result is 5. 
Result so far: 25.0
If we take 105 away from 118, we end up with 13.
Append the next digit (6) from the dividend to 13 and continue with: 136 / 21

Advancing to step 4:
136 divided by 21 is 6 with a remainder of 10.
Use 6 as the next digit of our solution. 
Result so far: 256.0
Subtract 126 from 136 to get 10.
Append the next digit (0) from the dividend to 10 and continue with: 100 / 21

Advancing to step 5:
100 divided by 21 is 4 with a remainder of 16.
The next digit of our result is 4. 
Result so far: 2564.0
If we take 84 away from 100, we end up with 16.
Grab the next digit (5) from the dividend, add it to 16, then carry on: 165 / 21

Step 6:
21 can be fit into 165 7 times, resulting in a remainder of 18.
Use 7 as the next digit of our solution. 
Result so far: 25647.0
Subtracting 147 from 165 leaves us with 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Moving on to step 7:
21 can be fit into 180 8 times, resulting in a remainder of 12.
The number 8 becomes the next digit in our result. 
Result so far: 25647.8
Subtract 168 from 180 to get 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Let's proceed to step 8:
When dividing 120 by 21, we get 5 with a remainder of 15.
Use 5 as the next digit of our solution. 
Result so far: 25647.85
If we subtract 105 from 120, we get 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Moving on to step 9:
150 divided by 21 is 7 with a remainder of 3.
Record the quotient 7 as the next digit in the result. 
Result so far: 25647.857
Subtract 147 from 150 to get 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Step 10:
21 can be fit into 30 1 times, resulting in a remainder of 9.
Put 1 as the next digit of the answer. 
Result so far: 25647.8571
If we take 21 away from 30, we end up with 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

On to step 11:
The number 21 fits into 90 4 times, leaving a remainder of 6.
Record the quotient 4 as the next digit in the result. 
Result so far: 25647.85714
Subtracting 84 from 90 leaves us with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Step 12:
60 divided by 21 is 2 with a remainder of 18.
Use 2 as the next digit of our solution. 
Result so far: 25647.857142
If we take 42 away from 60, we end up with 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Moving on to step 13:
When dividing 180 by 21, we get 8 with a remainder of 12.
Record the quotient 8 as the next digit in the result. 
Result so far: 25647.8571428
Deduct 168 from 180 and we're left with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Step 14:
When dividing 120 by 21, we get 5 with a remainder of 15.
Record the quotient 5 as the next digit in the result. 
Result so far: 25647.85714285
If we take 105 away from 120, we end up with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

In conclusion, the division gives 25647.85714285 with a balance of 1.5e-08.