871197 divided by 21 
We're looking to find how many times 21 goes into 871197.

On to step 1:
21 goes into 8 0 times with a remainder of 8.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 8, we end up with 8.
Bring next digit (7) of the dividend behind the 8 and repeat the process: 87 / 21

On to step 2:
The number 21 fits into 87 4 times, leaving a remainder of 3.
Record the quotient 4 as the next digit in the result. 
Result so far: 4.0
The remainder is 3 after subtracting 84 from 87.
Include the next digit (1) from the dividend after 3, then repeat: 31 / 21

Let's proceed to step 3:
The number 21 fits into 31 1 times, leaving a remainder of 10.
Put 1 as the next digit of the answer. 
Result so far: 41.0
If we take 21 away from 31, we end up with 10.
Grab the next digit (1) from the dividend, add it to 10, then carry on: 101 / 21

Step 4:
The number 21 fits into 101 4 times, leaving a remainder of 17.
Put 4 as the next digit of the answer. 
Result so far: 414.0
If we subtract 84 from 101, we get 17.
Take the next digit (9) from the dividend and append it to 17, then repeat: 179 / 21

Moving on to step 5:
21 can be fit into 179 8 times, resulting in a remainder of 11.
Record the quotient 8 as the next digit in the result. 
Result so far: 4148.0
The remainder is 11 after subtracting 168 from 179.
Append the next digit (7) from the dividend to 11 and continue with: 117 / 21

Step 6:
When dividing 117 by 21, we get 5 with a remainder of 12.
Record the quotient 5 as the next digit in the result. 
Result so far: 41485.0
Deduct 105 from 117 and we're left with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Let's proceed to step 7:
120 divided by 21 is 5 with a remainder of 15.
Record the quotient 5 as the next digit in the result. 
Result so far: 41485.5
Subtract 105 from 120 to get 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Going ahead to step 8:
150 divided by 21 is 7 with a remainder of 3.
The number 7 becomes the next digit in our result. 
Result so far: 41485.57
Subtract 147 from 150 to get 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Let's proceed to step 9:
When dividing 30 by 21, we get 1 with a remainder of 9.
The number 1 becomes the next digit in our result. 
Result so far: 41485.571
Deduct 21 from 30 and we're left with 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Going ahead to step 10:
90 divided by 21 is 4 with a remainder of 6.
The number 4 becomes the next digit in our result. 
Result so far: 41485.5714
If we take 84 away from 90, we end up with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Let's proceed to step 11:
21 goes into 60 2 times with a remainder of 18.
Write down 2 as next digit of the result. 
Result so far: 41485.57142
Subtract 42 from 60 to get 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Going ahead to step 12:
The number 21 fits into 180 8 times, leaving a remainder of 12.
The number 8 becomes the next digit in our result. 
Result so far: 41485.571428
The remainder is 12 after subtracting 168 from 180.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

On to step 13:
If we divide 120 by 21, we get 5 and a remainder of 15.
Record the quotient 5 as the next digit in the result. 
Result so far: 41485.5714285
The remainder is 15 after subtracting 105 from 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Step 14:
150 divided by 21 is 7 with a remainder of 3.
Use 7 as the next digit of our solution. 
Result so far: 41485.57142857
Subtract 147 from 150 to get 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

The final outcome is 41485.57142857, with a leftover of 3e-09.