872897 divided by 21 
Let's see how many times 21 fits into 872897.

Going ahead to step 1:
The number 21 fits into 8 0 times, leaving a remainder of 8.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 8, we get 8.
Append the next digit (7) from the dividend to 8 and continue with: 87 / 21

Step 2:
When dividing 87 by 21, we get 4 with a remainder of 3.
The number 4 becomes the next digit in our result. 
Result so far: 4.0
Subtract 84 from 87 to get 3.
Bring next digit (2) of the dividend behind the 3 and repeat the process: 32 / 21

Moving on to step 3:
When dividing 32 by 21, we get 1 with a remainder of 11.
Record the quotient 1 as the next digit in the result. 
Result so far: 41.0
Subtracting 21 from 32 leaves us with 11.
Grab the next digit (8) from the dividend, add it to 11, then carry on: 118 / 21

Let's proceed to step 4:
21 can be fit into 118 5 times, resulting in a remainder of 13.
The next digit of our result is 5. 
Result so far: 415.0
If we take 105 away from 118, we end up with 13.
Include the next digit (9) from the dividend after 13, then repeat: 139 / 21

Let's proceed to step 5:
21 goes into 139 6 times with a remainder of 13.
Record the quotient 6 as the next digit in the result. 
Result so far: 4156.0
The remainder is 13 after subtracting 126 from 139.
Append the next digit (7) from the dividend to 13 and continue with: 137 / 21

Let's proceed to step 6:
137 divided by 21 is 6 with a remainder of 11.
Record the quotient 6 as the next digit in the result. 
Result so far: 41566.0
Subtracting 126 from 137 leaves us with 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Going ahead to step 7:
The number 21 fits into 110 5 times, leaving a remainder of 5.
Use 5 as the next digit of our solution. 
Result so far: 41566.5
Subtracting 105 from 110 leaves us with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Going ahead to step 8:
21 can be fit into 50 2 times, resulting in a remainder of 8.
The next digit of our result is 2. 
Result so far: 41566.52
Subtracting 42 from 50 leaves us with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

On to step 9:
21 can be fit into 80 3 times, resulting in a remainder of 17.
Record the quotient 3 as the next digit in the result. 
Result so far: 41566.523
Deduct 63 from 80 and we're left with 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Going ahead to step 10:
If we divide 170 by 21, we get 8 and a remainder of 2.
The next digit of our result is 8. 
Result so far: 41566.5238
Deduct 168 from 170 and we're left with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Going ahead to step 11:
When dividing 20 by 21, we get 0 with a remainder of 20.
Put 0 as the next digit of the answer. 
Result so far: 41566.5238
Subtracting 0 from 20 leaves us with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

On to step 12:
21 can be fit into 200 9 times, resulting in a remainder of 11.
Put 9 as the next digit of the answer. 
Result so far: 41566.523809
If we subtract 189 from 200, we get 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Advancing to step 13:
110 divided by 21 is 5 with a remainder of 5.
The number 5 becomes the next digit in our result. 
Result so far: 41566.5238095
If we take 105 away from 110, we end up with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Let's proceed to step 14:
50 divided by 21 is 2 with a remainder of 8.
The next digit of our result is 2. 
Result so far: 41566.52380952
If we subtract 42 from 50, we get 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

In conclusion, the division gives 41566.52380952 with a balance of 8e-09.