We're dividing 255927 by 21 
Let's see how many times 21 fits into 255927.

Step 1:
21 goes into 2 0 times with a remainder of 2.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 2, we get 2.
Grab the next digit (5) from the dividend, add it to 2, then carry on: 25 / 21

Moving on to step 2:
If we divide 25 by 21, we get 1 and a remainder of 4.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Subtract 21 from 25 to get 4.
Fetch the next digit (5) from the dividend, attach it to 4 and continue: 45 / 21

Let's proceed to step 3:
21 can be fit into 45 2 times, resulting in a remainder of 3.
Put 2 as the next digit of the answer. 
Result so far: 12.0
If we take 42 away from 45, we end up with 3.
Fetch the next digit (9) from the dividend, attach it to 3 and continue: 39 / 21

Step 4:
If we divide 39 by 21, we get 1 and a remainder of 18.
Record the quotient 1 as the next digit in the result. 
Result so far: 121.0
Deduct 21 from 39 and we're left with 18.
Fetch the next digit (2) from the dividend, attach it to 18 and continue: 182 / 21

Going ahead to step 5:
The number 21 fits into 182 8 times, leaving a remainder of 14.
Put 8 as the next digit of the answer. 
Result so far: 1218.0
The remainder is 14 after subtracting 168 from 182.
Bring next digit (7) of the dividend behind the 14 and repeat the process: 147 / 21

Step 6:
21 can be fit into 147 7 times, resulting in a remainder of 0.
Put 7 as the next digit of the answer. 
Result so far: 12187.0
Subtract 147 from 147 to 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.

Going ahead to step 7:
21 can be fit into 0 0 times, resulting in a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 12187.0
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.

Moving on to step 8:
The number 21 fits into 0 0 times, leaving a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 12187.0
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 12187.0 with a balance of 0.0.