We're dividing 21125855 by 873 
Our goal is to divide 21125855 by 873.

Step 1:
If we divide 2 by 873, we get 0 and a remainder of 2.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 2 after subtracting 0 from 2.
Fetch the next digit (1) from the dividend, attach it to 2 and continue: 21 / 873

Let's proceed to step 2:
When dividing 21 by 873, we get 0 with a remainder of 21.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 21, we get 21.
Include the next digit (1) from the dividend after 21, then repeat: 211 / 873

Step 3:
If we divide 211 by 873, we get 0 and a remainder of 211.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 211 and we're left with 211.
Bring next digit (2) of the dividend behind the 211 and repeat the process: 2112 / 873

Moving on to step 4:
2112 divided by 873 is 2 with a remainder of 366.
The next digit of our result is 2. 
Result so far: 2.0
The remainder is 366 after subtracting 1746 from 2112.
Append the next digit (5) from the dividend to 366 and continue with: 3665 / 873

On to step 5:
873 goes into 3665 4 times with a remainder of 173.
The number 4 becomes the next digit in our result. 
Result so far: 24.0
If we subtract 3492 from 3665, we get 173.
Bring next digit (8) of the dividend behind the 173 and repeat the process: 1738 / 873

Advancing to step 6:
The number 873 fits into 1738 1 times, leaving a remainder of 865.
The number 1 becomes the next digit in our result. 
Result so far: 241.0
Subtract 873 from 1738 to get 865.
Include the next digit (5) from the dividend after 865, then repeat: 8655 / 873

Moving on to step 7:
873 can be fit into 8655 9 times, resulting in a remainder of 798.
Use 9 as the next digit of our solution. 
Result so far: 2419.0
The remainder is 798 after subtracting 7857 from 8655.
Bring next digit (5) of the dividend behind the 798 and repeat the process: 7985 / 873

Step 8:
When dividing 7985 by 873, we get 9 with a remainder of 128.
Use 9 as the next digit of our solution. 
Result so far: 24199.0
Deduct 7857 from 7985 and we're left with 128.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1280, and continue the process.

Advancing to step 9:
1280 divided by 873 is 1 with a remainder of 407.
The number 1 becomes the next digit in our result. 
Result so far: 24199.1
The remainder is 407 after subtracting 873 from 1280.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4070, and continue the process.

Going ahead to step 10:
If we divide 4070 by 873, we get 4 and a remainder of 578.
Write down 4 as next digit of the result. 
Result so far: 24199.14
Deduct 3492 from 4070 and we're left with 578.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5780, and continue the process.

Going ahead to step 11:
If we divide 5780 by 873, we get 6 and a remainder of 542.
Write down 6 as next digit of the result. 
Result so far: 24199.146
If we take 5238 away from 5780, we end up with 542.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5420, and continue the process.

On to step 12:
5420 divided by 873 is 6 with a remainder of 182.
Record the quotient 6 as the next digit in the result. 
Result so far: 24199.1466
If we subtract 5238 from 5420, we get 182.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1820, and continue the process.

The final result is 24199.1466 with a remainder of 0.00182.