We look at the division of 23877644 by 21 
We want to divide 23877644 by 21.

Moving on to step 1:
21 goes into 2 0 times with a remainder of 2.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 2 to get 2.
Bring next digit (3) of the dividend behind the 2 and repeat the process: 23 / 21

Going ahead to step 2:
When dividing 23 by 21, we get 1 with a remainder of 2.
Put 1 as the next digit of the answer. 
Result so far: 1.0
Subtract 21 from 23 to get 2.
Fetch the next digit (8) from the dividend, attach it to 2 and continue: 28 / 21

Moving on to step 3:
21 goes into 28 1 times with a remainder of 7.
Write down 1 as next digit of the result. 
Result so far: 11.0
Subtract 21 from 28 to get 7.
Append the next digit (7) from the dividend to 7 and continue with: 77 / 21

Moving on to step 4:
21 goes into 77 3 times with a remainder of 14.
Put 3 as the next digit of the answer. 
Result so far: 113.0
Deduct 63 from 77 and we're left with 14.
Grab the next digit (7) from the dividend, add it to 14, then carry on: 147 / 21

Moving on to step 5:
21 goes into 147 7 times with a remainder of 0.
Write down 7 as next digit of the result. 
Result so far: 1137.0
If we take 147 away from 147, we end up with 0.
Fetch the next digit (6) from the dividend, attach it to 0 and continue: 6 / 21

Step 6:
21 can be fit into 6 0 times, resulting in a remainder of 6.
Record the quotient 0 as the next digit in the result. 
Result so far: 11370.0
If we take 0 away from 6, we end up with 6.
Append the next digit (4) from the dividend to 6 and continue with: 64 / 21

Advancing to step 7:
The number 21 fits into 64 3 times, leaving a remainder of 1.
Put 3 as the next digit of the answer. 
Result so far: 113703.0
Subtracting 63 from 64 leaves us with 1.
Fetch the next digit (4) from the dividend, attach it to 1 and continue: 14 / 21

Let's proceed to step 8:
21 goes into 14 0 times with a remainder of 14.
The next digit of our result is 0. 
Result so far: 1137030.0
If we subtract 0 from 14, we get 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Moving on to step 9:
140 divided by 21 is 6 with a remainder of 14.
The number 6 becomes the next digit in our result. 
Result so far: 1137030.6
Deduct 126 from 140 and we're left with 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Moving on to step 10:
When dividing 140 by 21, we get 6 with a remainder of 14.
The number 6 becomes the next digit in our result. 
Result so far: 1137030.66
Subtracting 126 from 140 leaves us with 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

The final result is 1137030.66 with a remainder of 0.014.