We're dividing 21168108 by 210 
Let's see how many times 210 fits into 21168108.

Step 1:
If we divide 2 by 210, we get 0 and a remainder of 2.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 2, we get 2.
Grab the next digit (1) from the dividend, add it to 2, then carry on: 21 / 210

Step 2:
The number 210 fits into 21 0 times, leaving a remainder of 21.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 21 after subtracting 0 from 21.
Take the next digit (1) from the dividend and append it to 21, then repeat: 211 / 210

Let's proceed to step 3:
When dividing 211 by 210, we get 1 with a remainder of 1.
Put 1 as the next digit of the answer. 
Result so far: 1.0
The remainder is 1 after subtracting 210 from 211.
Include the next digit (6) from the dividend after 1, then repeat: 16 / 210

Let's proceed to step 4:
210 can be fit into 16 0 times, resulting in a remainder of 16.
The number 0 becomes the next digit in our result. 
Result so far: 10.0
Subtract 0 from 16 to get 16.
Take the next digit (8) from the dividend and append it to 16, then repeat: 168 / 210

Let's proceed to step 5:
When dividing 168 by 210, we get 0 with a remainder of 168.
Put 0 as the next digit of the answer. 
Result so far: 100.0
If we take 0 away from 168, we end up with 168.
Grab the next digit (1) from the dividend, add it to 168, then carry on: 1681 / 210

Moving on to step 6:
210 goes into 1681 8 times with a remainder of 1.
Write down 8 as next digit of the result. 
Result so far: 1008.0
If we take 1680 away from 1681, we end up with 1.
Fetch the next digit (0) from the dividend, attach it to 1 and continue: 10 / 210

Moving on to step 7:
The number 210 fits into 10 0 times, leaving a remainder of 10.
Record the quotient 0 as the next digit in the result. 
Result so far: 10080.0
If we take 0 away from 10, we end up with 10.
Bring next digit (8) of the dividend behind the 10 and repeat the process: 108 / 210

On to step 8:
If we divide 108 by 210, we get 0 and a remainder of 108.
Use 0 as the next digit of our solution. 
Result so far: 100800.0
Deduct 0 from 108 and we're left with 108.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1080, and continue the process.

Moving on to step 9:
1080 divided by 210 is 5 with a remainder of 30.
Write down 5 as next digit of the result. 
Result so far: 100800.5
Subtract 1050 from 1080 to get 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Let's proceed to step 10:
210 goes into 300 1 times with a remainder of 90.
Put 1 as the next digit of the answer. 
Result so far: 100800.51
Subtracting 210 from 300 leaves us with 90.
Since there are no more digits in the dividend, we add a zero to the remainder making it 900, and continue the process.

Let's proceed to step 11:
The number 210 fits into 900 4 times, leaving a remainder of 60.
The next digit of our result is 4. 
Result so far: 100800.514
The remainder is 60 after subtracting 840 from 900.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

On to step 12:
If we divide 600 by 210, we get 2 and a remainder of 180.
Write down 2 as next digit of the result. 
Result so far: 100800.5142
Subtracting 420 from 600 leaves us with 180.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1800, and continue the process.

Advancing to step 13:
The number 210 fits into 1800 8 times, leaving a remainder of 120.
Record the quotient 8 as the next digit in the result. 
Result so far: 100800.51428
If we take 1680 away from 1800, we end up with 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1200, and continue the process.

Let's proceed to step 14:
The number 210 fits into 1200 5 times, leaving a remainder of 150.
Use 5 as the next digit of our solution. 
Result so far: 100800.514285
Subtract 1050 from 1200 to get 150.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1500, and continue the process.

Step 15:
If we divide 1500 by 210, we get 7 and a remainder of 30.
Record the quotient 7 as the next digit in the result. 
Result so far: 100800.5142857
Subtract 1470 from 1500 to get 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Advancing to step 16:
If we divide 300 by 210, we get 1 and a remainder of 90.
The number 1 becomes the next digit in our result. 
Result so far: 100800.51428571
The remainder is 90 after subtracting 210 from 300.
Since there are no more digits in the dividend, we add a zero to the remainder making it 900, and continue the process.

In conclusion, the division gives 100800.51428571 with a balance of 9e-08.