21138975 ÷ 254 
Our goal is to divide 21138975 by 254.

Going ahead to step 1:
254 goes into 2 0 times with a remainder of 2.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 2 after subtracting 0 from 2.
Include the next digit (1) from the dividend after 2, then repeat: 21 / 254

Let's proceed to step 2:
When dividing 21 by 254, we get 0 with a remainder of 21.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 21 after subtracting 0 from 21.
Bring next digit (1) of the dividend behind the 21 and repeat the process: 211 / 254

Moving on to step 3:
211 divided by 254 is 0 with a remainder of 211.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 211, we get 211.
Append the next digit (3) from the dividend to 211 and continue with: 2113 / 254

Going ahead to step 4:
The number 254 fits into 2113 8 times, leaving a remainder of 81.
Use 8 as the next digit of our solution. 
Result so far: 8.0
Subtract 2032 from 2113 to get 81.
Append the next digit (8) from the dividend to 81 and continue with: 818 / 254

Let's proceed to step 5:
818 divided by 254 is 3 with a remainder of 56.
Write down 3 as next digit of the result. 
Result so far: 83.0
If we subtract 762 from 818, we get 56.
Bring next digit (9) of the dividend behind the 56 and repeat the process: 569 / 254

Let's proceed to step 6:
569 divided by 254 is 2 with a remainder of 61.
Record the quotient 2 as the next digit in the result. 
Result so far: 832.0
If we subtract 508 from 569, we get 61.
Include the next digit (7) from the dividend after 61, then repeat: 617 / 254

Step 7:
254 goes into 617 2 times with a remainder of 109.
Record the quotient 2 as the next digit in the result. 
Result so far: 8322.0
Subtracting 508 from 617 leaves us with 109.
Take the next digit (5) from the dividend and append it to 109, then repeat: 1095 / 254

On to step 8:
When dividing 1095 by 254, we get 4 with a remainder of 79.
Put 4 as the next digit of the answer. 
Result so far: 83224.0
Subtracting 1016 from 1095 leaves us with 79.
Since there are no more digits in the dividend, we add a zero to the remainder making it 790, and continue the process.

Step 9:
254 can be fit into 790 3 times, resulting in a remainder of 28.
The next digit of our result is 3. 
Result so far: 83224.3
The remainder is 28 after subtracting 762 from 790.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

Step 10:
254 can be fit into 280 1 times, resulting in a remainder of 26.
Use 1 as the next digit of our solution. 
Result so far: 83224.31
Subtracting 254 from 280 leaves us with 26.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

Going ahead to step 11:
260 divided by 254 is 1 with a remainder of 6.
The next digit of our result is 1. 
Result so far: 83224.311
Subtract 254 from 260 to get 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

The final result is 83224.311 with a remainder of 0.0006.