21615308 ÷ 873 
Our goal is to divide 21615308 by 873.

Moving on to step 1:
The number 873 fits into 2 0 times, leaving a remainder of 2.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 2, we get 2.
Append the next digit (1) from the dividend to 2 and continue with: 21 / 873

On to step 2:
If we divide 21 by 873, we get 0 and a remainder of 21.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 21 after subtracting 0 from 21.
Bring next digit (6) of the dividend behind the 21 and repeat the process: 216 / 873

Going ahead to step 3:
If we divide 216 by 873, we get 0 and a remainder of 216.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 216 and we're left with 216.
Take the next digit (1) from the dividend and append it to 216, then repeat: 2161 / 873

Moving on to step 4:
873 can be fit into 2161 2 times, resulting in a remainder of 415.
Use 2 as the next digit of our solution. 
Result so far: 2.0
Deduct 1746 from 2161 and we're left with 415.
Take the next digit (5) from the dividend and append it to 415, then repeat: 4155 / 873

Moving on to step 5:
The number 873 fits into 4155 4 times, leaving a remainder of 663.
The number 4 becomes the next digit in our result. 
Result so far: 24.0
Subtracting 3492 from 4155 leaves us with 663.
Include the next digit (3) from the dividend after 663, then repeat: 6633 / 873

Advancing to step 6:
873 can be fit into 6633 7 times, resulting in a remainder of 522.
Write down 7 as next digit of the result. 
Result so far: 247.0
Subtract 6111 from 6633 to get 522.
Fetch the next digit (0) from the dividend, attach it to 522 and continue: 5220 / 873

On to step 7:
5220 divided by 873 is 5 with a remainder of 855.
Use 5 as the next digit of our solution. 
Result so far: 2475.0
If we take 4365 away from 5220, we end up with 855.
Grab the next digit (8) from the dividend, add it to 855, then carry on: 8558 / 873

Step 8:
When dividing 8558 by 873, we get 9 with a remainder of 701.
Put 9 as the next digit of the answer. 
Result so far: 24759.0
If we subtract 7857 from 8558, we get 701.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7010, and continue the process.

Let's proceed to step 9:
873 goes into 7010 8 times with a remainder of 26.
Put 8 as the next digit of the answer. 
Result so far: 24759.8
If we take 6984 away from 7010, we end up 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.

Let's proceed to step 10:
873 goes into 260 0 times with a remainder of 260.
Record the quotient 0 as the next digit in the result. 
Result so far: 24759.8
Subtract 0 from 260 to get 260.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2600, and continue the process.

Step 11:
873 goes into 2600 2 times with a remainder of 854.
Put 2 as the next digit of the answer. 
Result so far: 24759.802
If we take 1746 away from 2600, we end up with 854.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8540, and continue the process.

Advancing to step 12:
When dividing 8540 by 873, we get 9 with a remainder of 683.
Write down 9 as next digit of the result. 
Result so far: 24759.8029
The remainder is 683 after subtracting 7857 from 8540.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6830, and continue the process.

Moving on to step 13:
873 can be fit into 6830 7 times, resulting in a remainder of 719.
The next digit of our result is 7. 
Result so far: 24759.80297
Deduct 6111 from 6830 and we're left with 719.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7190, and continue the process.

Moving on to step 14:
7190 divided by 873 is 8 with a remainder of 206.
The number 8 becomes the next digit in our result. 
Result so far: 24759.802978
The remainder is 206 after subtracting 6984 from 7190.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2060, and continue the process.

Step 15:
873 can be fit into 2060 2 times, resulting in a remainder of 314.
Put 2 as the next digit of the answer. 
Result so far: 24759.8029782
If we subtract 1746 from 2060, we get 314.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3140, and continue the process.

Advancing to step 16:
When dividing 3140 by 873, we get 3 with a remainder of 521.
Put 3 as the next digit of the answer. 
Result so far: 24759.80297823
Subtracting 2619 from 3140 leaves us with 521.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5210, and continue the process.

The final outcome is 24759.80297823, with a leftover of 5.21e-07.