21493172 ÷ 866 
Let's see how many times 866 fits into 21493172.

Step 1:
866 can be fit into 2 0 times, resulting in a remainder of 2.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 2 leaves us with 2.
Include the next digit (1) from the dividend after 2, then repeat: 21 / 866

Let's proceed to step 2:
21 divided by 866 is 0 with a remainder of 21.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 21 to get 21.
Bring next digit (4) of the dividend behind the 21 and repeat the process: 214 / 866

Going ahead to step 3:
214 divided by 866 is 0 with a remainder of 214.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 214, we end up with 214.
Include the next digit (9) from the dividend after 214, then repeat: 2149 / 866

Advancing to step 4:
When dividing 2149 by 866, we get 2 with a remainder of 417.
The next digit of our result is 2. 
Result so far: 2.0
If we take 1732 away from 2149, we end up with 417.
Fetch the next digit (3) from the dividend, attach it to 417 and continue: 4173 / 866

Step 5:
The number 866 fits into 4173 4 times, leaving a remainder of 709.
The next digit of our result is 4. 
Result so far: 24.0
If we take 3464 away from 4173, we end up with 709.
Append the next digit (1) from the dividend to 709 and continue with: 7091 / 866

Let's proceed to step 6:
866 goes into 7091 8 times with a remainder of 163.
Record the quotient 8 as the next digit in the result. 
Result so far: 248.0
Subtract 6928 from 7091 to get 163.
Take the next digit (7) from the dividend and append it to 163, then repeat: 1637 / 866

Let's proceed to step 7:
866 can be fit into 1637 1 times, resulting in a remainder of 771.
Write down 1 as next digit of the result. 
Result so far: 2481.0
If we take 866 away from 1637, we end up with 771.
Grab the next digit (2) from the dividend, add it to 771, then carry on: 7712 / 866

Moving on to step 8:
The number 866 fits into 7712 8 times, leaving a remainder of 784.
Put 8 as the next digit of the answer. 
Result so far: 24818.0
Deduct 6928 from 7712 and we're left with 784.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7840, and continue the process.

Going ahead to step 9:
7840 divided by 866 is 9 with a remainder of 46.
Record the quotient 9 as the next digit in the result. 
Result so far: 24818.9
Deduct 7794 from 7840 and we're left with 46.
Since there are no more digits in the dividend, we add a zero to the remainder making it 460, and continue the process.

Advancing to step 10:
The number 866 fits into 460 0 times, leaving a remainder of 460.
Put 0 as the next digit of the answer. 
Result so far: 24818.9
Subtract 0 from 460 to get 460.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4600, and continue the process.

Moving on to step 11:
866 goes into 4600 5 times with a remainder of 270.
The number 5 becomes the next digit in our result. 
Result so far: 24818.905
Subtract 4330 from 4600 to get 270.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2700, and continue the process.

Moving on to step 12:
The number 866 fits into 2700 3 times, leaving a remainder of 102.
The number 3 becomes the next digit in our result. 
Result so far: 24818.9053
Deduct 2598 from 2700 and we're left with 102.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1020, and continue the process.

Step 13:
1020 divided by 866 is 1 with a remainder of 154.
Put 1 as the next digit of the answer. 
Result so far: 24818.90531
Subtracting 866 from 1020 leaves us with 154.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1540, and continue the process.

Advancing to step 14:
If we divide 1540 by 866, we get 1 and a remainder of 674.
The next digit of our result is 1. 
Result so far: 24818.905311
Subtracting 866 from 1540 leaves us with 674.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6740, and continue the process.

After the division, we end up with 24818.905311 and a remainder of 6.74e-05.