We look at the division of 21006543 by 393 
We want to divide 21006543 by 393.

Advancing to step 1:
The number 393 fits into 2 0 times, leaving 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.
Append the next digit (1) from the dividend to 2 and continue with: 21 / 393

Advancing to step 2:
393 can be fit into 21 0 times, resulting in a remainder of 21.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 21, we get 21.
Grab the next digit (0) from the dividend, add it to 21, then carry on: 210 / 393

Let's proceed to step 3:
393 can be fit into 210 0 times, resulting in a remainder of 210.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 210 leaves us with 210.
Append the next digit (0) from the dividend to 210 and continue with: 2100 / 393

On to step 4:
The number 393 fits into 2100 5 times, leaving a remainder of 135.
Record the quotient 5 as the next digit in the result. 
Result so far: 5.0
If we take 1965 away from 2100, we end up with 135.
Grab the next digit (6) from the dividend, add it to 135, then carry on: 1356 / 393

Advancing to step 5:
393 goes into 1356 3 times with a remainder of 177.
Write down 3 as next digit of the result. 
Result so far: 53.0
The remainder is 177 after subtracting 1179 from 1356.
Take the next digit (5) from the dividend and append it to 177, then repeat: 1775 / 393

Moving on to step 6:
393 goes into 1775 4 times with a remainder of 203.
Put 4 as the next digit of the answer. 
Result so far: 534.0
Subtract 1572 from 1775 to get 203.
Fetch the next digit (4) from the dividend, attach it to 203 and continue: 2034 / 393

Let's proceed to step 7:
393 goes into 2034 5 times with a remainder of 69.
The next digit of our result is 5. 
Result so far: 5345.0
If we take 1965 away from 2034, we end up with 69.
Take the next digit (3) from the dividend and append it to 69, then repeat: 693 / 393

Let's proceed to step 8:
393 goes into 693 1 times with a remainder of 300.
Put 1 as the next digit of the answer. 
Result so far: 53451.0
If we subtract 393 from 693, we get 300.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3000, and continue the process.

Going ahead to step 9:
393 can be fit into 3000 7 times, resulting in a remainder of 249.
Put 7 as the next digit of the answer. 
Result so far: 53451.7
The remainder is 249 after subtracting 2751 from 3000.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2490, and continue the process.

On to step 10:
393 goes into 2490 6 times with a remainder of 132.
The next digit of our result is 6. 
Result so far: 53451.76
If we take 2358 away from 2490, we end up with 132.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1320, and continue the process.

Step 11:
If we divide 1320 by 393, we get 3 and a remainder of 141.
Put 3 as the next digit of the answer. 
Result so far: 53451.763
The remainder is 141 after subtracting 1179 from 1320.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1410, and continue the process.

Going ahead to step 12:
1410 divided by 393 is 3 with a remainder of 231.
Record the quotient 3 as the next digit in the result. 
Result so far: 53451.7633
The remainder is 231 after subtracting 1179 from 1410.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2310, and continue the process.

In conclusion, the division gives 53451.7633 with a balance of 0.00231.