We look at the division of 21337793 by 309 
We want to divide 21337793 by 309.

Advancing to step 1:
If we divide 2 by 309, we get 0 and a remainder of 2.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 2, we get 2.
Bring next digit (1) of the dividend behind the 2 and repeat the process: 21 / 309

Going ahead to step 2:
309 goes into 21 0 times with 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.
Append the next digit (3) from the dividend to 21 and continue with: 213 / 309

Step 3:
309 goes into 213 0 times with a remainder of 213.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 213 to get 213.
Take the next digit (3) from the dividend and append it to 213, then repeat: 2133 / 309

Advancing to step 4:
309 goes into 2133 6 times with a remainder of 279.
The next digit of our result is 6. 
Result so far: 6.0
Subtracting 1854 from 2133 leaves us with 279.
Append the next digit (7) from the dividend to 279 and continue with: 2797 / 309

On to step 5:
The number 309 fits into 2797 9 times, leaving a remainder of 16.
Put 9 as the next digit of the answer. 
Result so far: 69.0
The remainder is 16 after subtracting 2781 from 2797.
Fetch the next digit (7) from the dividend, attach it to 16 and continue: 167 / 309

On to step 6:
If we divide 167 by 309, we get 0 and a remainder of 167.
Use 0 as the next digit of our solution. 
Result so far: 690.0
Deduct 0 from 167 and we're left with 167.
Take the next digit (9) from the dividend and append it to 167, then repeat: 1679 / 309

On to step 7:
309 can be fit into 1679 5 times, resulting in a remainder of 134.
Put 5 as the next digit of the answer. 
Result so far: 6905.0
Deduct 1545 from 1679 and we're left with 134.
Grab the next digit (3) from the dividend, add it to 134, then carry on: 1343 / 309

Let's proceed to step 8:
The number 309 fits into 1343 4 times, leaving a remainder of 107.
The number 4 becomes the next digit in our result. 
Result so far: 69054.0
The remainder is 107 after subtracting 1236 from 1343.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1070, and continue the process.

Step 9:
309 can be fit into 1070 3 times, resulting in a remainder of 143.
Write down 3 as next digit of the result. 
Result so far: 69054.3
The remainder is 143 after subtracting 927 from 1070.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1430, and continue the process.

Advancing to step 10:
If we divide 1430 by 309, we get 4 and a remainder of 194.
Write down 4 as next digit of the result. 
Result so far: 69054.34
The remainder is 194 after subtracting 1236 from 1430.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1940, and continue the process.

Advancing to step 11:
1940 divided by 309 is 6 with a remainder of 86.
Use 6 as the next digit of our solution. 
Result so far: 69054.346
The remainder is 86 after subtracting 1854 from 1940.
Since there are no more digits in the dividend, we add a zero to the remainder making it 860, and continue the process.

Let's proceed to step 12:
When dividing 860 by 309, we get 2 with a remainder of 242.
The number 2 becomes the next digit in our result. 
Result so far: 69054.3462
Subtract 618 from 860 to get 242.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2420, and continue the process.

Advancing to step 13:
309 goes into 2420 7 times with a remainder of 257.
Write down 7 as next digit of the result. 
Result so far: 69054.34627
Deduct 2163 from 2420 and we're left with 257.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2570, and continue the process.

Step 14:
2570 divided by 309 is 8 with a remainder of 98.
The next digit of our result is 8. 
Result so far: 69054.346278
If we subtract 2472 from 2570, we get 98.
Since there are no more digits in the dividend, we add a zero to the remainder making it 980, and continue the process.

On to step 15:
980 divided by 309 is 3 with a remainder of 53.
The next digit of our result is 3. 
Result so far: 69054.3462783
If we subtract 927 from 980, we get 53.
Since there are no more digits in the dividend, we add a zero to the remainder making it 530, and continue the process.

Going ahead to step 16:
When dividing 530 by 309, we get 1 with a remainder of 221.
The number 1 becomes the next digit in our result. 
Result so far: 69054.34627831
Subtracting 309 from 530 leaves us with 221.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2210, and continue the process.

In conclusion, the division gives 69054.34627831 with a balance of 2.21e-07.