21859923 ÷ 209 
Our goal is to divide 21859923 by 209.

On to step 1:
209 goes into 2 0 times with a remainder of 2.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 2, we end up with 2.
Include the next digit (1) from the dividend after 2, then repeat: 21 / 209

On to step 2:
The number 209 fits into 21 0 times, leaving a remainder of 21.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 21 to get 21.
Append the next digit (8) from the dividend to 21 and continue with: 218 / 209

Going ahead to step 3:
The number 209 fits into 218 1 times, leaving a remainder of 9.
Write down 1 as next digit of the result. 
Result so far: 1.0
Deduct 209 from 218 and we're left with 9.
Include the next digit (5) from the dividend after 9, then repeat: 95 / 209

On to step 4:
95 divided by 209 is 0 with a remainder of 95.
Use 0 as the next digit of our solution. 
Result so far: 10.0
If we subtract 0 from 95, we get 95.
Grab the next digit (9) from the dividend, add it to 95, then carry on: 959 / 209

Moving on to step 5:
If we divide 959 by 209, we get 4 and a remainder of 123.
Put 4 as the next digit of the answer. 
Result so far: 104.0
If we take 836 away from 959, we end up with 123.
Include the next digit (9) from the dividend after 123, then repeat: 1239 / 209

Going ahead to step 6:
If we divide 1239 by 209, we get 5 and a remainder of 194.
Write down 5 as next digit of the result. 
Result so far: 1045.0
If we take 1045 away from 1239, we end up with 194.
Take the next digit (2) from the dividend and append it to 194, then repeat: 1942 / 209

Step 7:
When dividing 1942 by 209, we get 9 with a remainder of 61.
The next digit of our result is 9. 
Result so far: 10459.0
Subtracting 1881 from 1942 leaves us with 61.
Bring next digit (3) of the dividend behind the 61 and repeat the process: 613 / 209

Going ahead to step 8:
The number 209 fits into 613 2 times, leaving a remainder of 195.
The next digit of our result is 2. 
Result so far: 104592.0
Deduct 418 from 613 and we're left with 195.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1950, and continue the process.

Advancing to step 9:
1950 divided by 209 is 9 with a remainder of 69.
Put 9 as the next digit of the answer. 
Result so far: 104592.9
The remainder is 69 after subtracting 1881 from 1950.
Since there are no more digits in the dividend, we add a zero to the remainder making it 690, and continue the process.

Going ahead to step 10:
The number 209 fits into 690 3 times, leaving a remainder of 63.
The next digit of our result is 3. 
Result so far: 104592.93
Subtract 627 from 690 to get 63.
Since there are no more digits in the dividend, we add a zero to the remainder making it 630, and continue the process.

On to step 11:
209 can be fit into 630 3 times, resulting in a remainder of 3.
Put 3 as the next digit of the answer. 
Result so far: 104592.933
The remainder is 3 after subtracting 627 from 630.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

In conclusion, the division gives 104592.933 with a balance of 0.0003.