21165912 ÷ 209 
Let's see how many times 209 fits into 21165912.

Going ahead to step 1:
The number 209 fits into 2 0 times, leaving a remainder of 2.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 2 and we're left with 2.
Include the next digit (1) from the dividend after 2, then repeat: 21 / 209

Step 2:
If we divide 21 by 209, we get 0 and a remainder of 21.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 21, we end up with 21.
Append the next digit (1) from the dividend to 21 and continue with: 211 / 209

Step 3:
209 goes into 211 1 times with a remainder of 2.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
The remainder is 2 after subtracting 209 from 211.
Bring next digit (6) of the dividend behind the 2 and repeat the process: 26 / 209

Step 4:
When dividing 26 by 209, we get 0 with a remainder of 26.
The number 0 becomes the next digit in our result. 
Result so far: 10.0
Subtract 0 from 26 to get 26.
Append the next digit (5) from the dividend to 26 and continue with: 265 / 209

Moving on to step 5:
When dividing 265 by 209, we get 1 with a remainder of 56.
Put 1 as the next digit of the answer. 
Result so far: 101.0
If we subtract 209 from 265, we get 56.
Take the next digit (9) from the dividend and append it to 56, then repeat: 569 / 209

Moving on to step 6:
569 divided by 209 is 2 with a remainder of 151.
The number 2 becomes the next digit in our result. 
Result so far: 1012.0
Subtracting 418 from 569 leaves us with 151.
Bring next digit (1) of the dividend behind the 151 and repeat the process: 1511 / 209

On to step 7:
The number 209 fits into 1511 7 times, leaving a remainder of 48.
Put 7 as the next digit of the answer. 
Result so far: 10127.0
If we subtract 1463 from 1511, we get 48.
Bring next digit (2) of the dividend behind the 48 and repeat the process: 482 / 209

Advancing to step 8:
The number 209 fits into 482 2 times, leaving a remainder of 64.
Use 2 as the next digit of our solution. 
Result so far: 101272.0
Subtract 418 from 482 to get 64.
Since there are no more digits in the dividend, we add a zero to the remainder making it 640, and continue the process.

Going ahead to step 9:
209 goes into 640 3 times with a remainder of 13.
Write down 3 as next digit of the result. 
Result so far: 101272.3
Subtract 627 from 640 to get 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

Moving on to step 10:
130 divided by 209 is 0 with a remainder of 130.
Record the quotient 0 as the next digit in the result. 
Result so far: 101272.3
The remainder is 130 after subtracting 0 from 130.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1300, and continue the process.

Going ahead to step 11:
209 can be fit into 1300 6 times, resulting in a remainder of 46.
The next digit of our result is 6. 
Result so far: 101272.306
Deduct 1254 from 1300 and we're left with 46.
Since there are no more digits in the dividend, we add a zero to the remainder making it 460, and continue the process.

On to step 12:
The number 209 fits into 460 2 times, leaving a remainder of 42.
Use 2 as the next digit of our solution. 
Result so far: 101272.3062
Subtract 418 from 460 to get 42.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

On to step 13:
If we divide 420 by 209, we get 2 and a remainder of 2.
Record the quotient 2 as the next digit in the result. 
Result so far: 101272.30622
Subtract 418 from 420 to get 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

In conclusion, the division gives 101272.30622 with a balance of 2e-06.