21551015 divided by 907 
We want to figure out the number of times 21551015 can be divided by 907.

Moving on to step 1:
907 can be fit into 2 0 times, resulting in a remainder of 2.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 2 after subtracting 0 from 2.
Take the next digit (1) from the dividend and append it to 2, then repeat: 21 / 907

Step 2:
907 goes into 21 0 times with a remainder of 21.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 21 after subtracting 0 from 21.
Include the next digit (5) from the dividend after 21, then repeat: 215 / 907

Moving on to step 3:
907 can be fit into 215 0 times, resulting in a remainder of 215.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 215 to get 215.
Append the next digit (5) from the dividend to 215 and continue with: 2155 / 907

Let's proceed to step 4:
907 goes into 2155 2 times with a remainder of 341.
Record the quotient 2 as the next digit in the result. 
Result so far: 2.0
The remainder is 341 after subtracting 1814 from 2155.
Take the next digit (1) from the dividend and append it to 341, then repeat: 3411 / 907

On to step 5:
907 goes into 3411 3 times with a remainder of 690.
Write down 3 as next digit of the result. 
Result so far: 23.0
If we subtract 2721 from 3411, we get 690.
Bring next digit (0) of the dividend behind the 690 and repeat the process: 6900 / 907

Let's proceed to step 6:
6900 divided by 907 is 7 with a remainder of 551.
The next digit of our result is 7. 
Result so far: 237.0
Deduct 6349 from 6900 and we're left with 551.
Include the next digit (1) from the dividend after 551, then repeat: 5511 / 907

Moving on to step 7:
5511 divided by 907 is 6 with a remainder of 69.
Record the quotient 6 as the next digit in the result. 
Result so far: 2376.0
Deduct 5442 from 5511 and we're left with 69.
Append the next digit (5) from the dividend to 69 and continue with: 695 / 907

Let's proceed to step 8:
If we divide 695 by 907, we get 0 and a remainder of 695.
The next digit of our result is 0. 
Result so far: 23760.0
Deduct 0 from 695 and we're left with 695.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6950, and continue the process.

Going ahead to step 9:
907 goes into 6950 7 times with a remainder of 601.
Put 7 as the next digit of the answer. 
Result so far: 23760.7
Deduct 6349 from 6950 and we're left with 601.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6010, and continue the process.

Advancing to step 10:
907 goes into 6010 6 times with a remainder of 568.
Record the quotient 6 as the next digit in the result. 
Result so far: 23760.76
The remainder is 568 after subtracting 5442 from 6010.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5680, and continue the process.

Step 11:
The number 907 fits into 5680 6 times, leaving a remainder of 238.
Put 6 as the next digit of the answer. 
Result so far: 23760.766
Subtract 5442 from 5680 to get 238.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2380, and continue the process.

The quotient of the division is 23760.766, and the remainder is 0.0238.