21019378 ÷ 543 
Our goal is to divide 21019378 by 543.

Moving on to step 1:
If we divide 2 by 543, we get 0 and a remainder of 2.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 2 leaves us with 2.
Take the next digit (1) from the dividend and append it to 2, then repeat: 21 / 543

On to step 2:
543 goes into 21 0 times with a remainder of 21.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 21 to get 21.
Grab the next digit (0) from the dividend, add it to 21, then carry on: 210 / 543

Advancing to step 3:
543 can be fit into 210 0 times, resulting in a remainder of 210.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 210 after subtracting 0 from 210.
Fetch the next digit (1) from the dividend, attach it to 210 and continue: 2101 / 543

Advancing to step 4:
The number 543 fits into 2101 3 times, leaving a remainder of 472.
Record the quotient 3 as the next digit in the result. 
Result so far: 3.0
Subtracting 1629 from 2101 leaves us with 472.
Bring next digit (9) of the dividend behind the 472 and repeat the process: 4729 / 543

On to step 5:
543 can be fit into 4729 8 times, resulting in a remainder of 385.
The number 8 becomes the next digit in our result. 
Result so far: 38.0
If we subtract 4344 from 4729, we get 385.
Include the next digit (3) from the dividend after 385, then repeat: 3853 / 543

Step 6:
The number 543 fits into 3853 7 times, leaving a remainder of 52.
Write down 7 as next digit of the result. 
Result so far: 387.0
If we take 3801 away from 3853, we end up with 52.
Append the next digit (7) from the dividend to 52 and continue with: 527 / 543

Going ahead to step 7:
If we divide 527 by 543, we get 0 and a remainder of 527.
Put 0 as the next digit of the answer. 
Result so far: 3870.0
If we subtract 0 from 527, we get 527.
Append the next digit (8) from the dividend to 527 and continue with: 5278 / 543

Advancing to step 8:
The number 543 fits into 5278 9 times, leaving a remainder of 391.
Write down 9 as next digit of the result. 
Result so far: 38709.0
If we take 4887 away from 5278, we end up with 391.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3910, and continue the process.

On to step 9:
543 goes into 3910 7 times with a remainder of 109.
Write down 7 as next digit of the result. 
Result so far: 38709.7
Deduct 3801 from 3910 and we're left with 109.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1090, and continue the process.

Moving on to step 10:
543 goes into 1090 2 times with a remainder of 4.
The next digit of our result is 2. 
Result so far: 38709.72
Subtract 1086 from 1090 to get 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Advancing to step 11:
543 can be fit into 40 0 times, resulting in a remainder of 40.
The number 0 becomes the next digit in our result. 
Result so far: 38709.72
Subtracting 0 from 40 leaves us with 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Moving on to step 12:
When dividing 400 by 543, we get 0 with a remainder of 400.
Record the quotient 0 as the next digit in the result. 
Result so far: 38709.72
The remainder is 400 after subtracting 0 from 400.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4000, and continue the process.

The quotient of the division is 38709.72, and the remainder is 0.004.