We're dividing 21468993 by 721 
We want to figure out the number of times 21468993 can be divided by 721.

Step 1:
721 can be fit into 2 0 times, resulting in a remainder of 2.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 2 after subtracting 0 from 2.
Grab the next digit (1) from the dividend, add it to 2, then carry on: 21 / 721

Advancing to step 2:
721 can be fit into 21 0 times, resulting in a remainder of 21.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 21, we get 21.
Take the next digit (4) from the dividend and append it to 21, then repeat: 214 / 721

Going ahead to step 3:
The number 721 fits into 214 0 times, leaving a remainder of 214.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 214 after subtracting 0 from 214.
Append the next digit (6) from the dividend to 214 and continue with: 2146 / 721

Going ahead to step 4:
721 goes into 2146 2 times with a remainder of 704.
Record the quotient 2 as the next digit in the result. 
Result so far: 2.0
Subtracting 1442 from 2146 leaves us with 704.
Fetch the next digit (8) from the dividend, attach it to 704 and continue: 7048 / 721

On to step 5:
When dividing 7048 by 721, we get 9 with a remainder of 559.
The number 9 becomes the next digit in our result. 
Result so far: 29.0
Subtract 6489 from 7048 to get 559.
Take the next digit (9) from the dividend and append it to 559, then repeat: 5599 / 721

On to step 6:
721 goes into 5599 7 times with a remainder of 552.
Use 7 as the next digit of our solution. 
Result so far: 297.0
The remainder is 552 after subtracting 5047 from 5599.
Include the next digit (9) from the dividend after 552, then repeat: 5529 / 721

Step 7:
The number 721 fits into 5529 7 times, leaving a remainder of 482.
Use 7 as the next digit of our solution. 
Result so far: 2977.0
Deduct 5047 from 5529 and we're left with 482.
Take the next digit (3) from the dividend and append it to 482, then repeat: 4823 / 721

Step 8:
721 can be fit into 4823 6 times, resulting in a remainder of 497.
The next digit of our result is 6. 
Result so far: 29776.0
Deduct 4326 from 4823 and we're left with 497.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4970, and continue the process.

Let's proceed to step 9:
If we divide 4970 by 721, we get 6 and a remainder of 644.
The next digit of our result is 6. 
Result so far: 29776.6
The remainder is 644 after subtracting 4326 from 4970.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6440, and continue the process.

Advancing to step 10:
721 goes into 6440 8 times with a remainder of 672.
The number 8 becomes the next digit in our result. 
Result so far: 29776.68
The remainder is 672 after subtracting 5768 from 6440.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6720, and continue the process.

Let's proceed to step 11:
When dividing 6720 by 721, we get 9 with a remainder of 231.
The number 9 becomes the next digit in our result. 
Result so far: 29776.689
The remainder is 231 after subtracting 6489 from 6720.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2310, and continue the process.

Advancing to step 12:
If we divide 2310 by 721, we get 3 and a remainder of 147.
The number 3 becomes the next digit in our result. 
Result so far: 29776.6893
If we take 2163 away from 2310, we end up with 147.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1470, and continue the process.

Advancing to step 13:
1470 divided by 721 is 2 with a remainder of 28.
Use 2 as the next digit of our solution. 
Result so far: 29776.68932
If we take 1442 away from 1470, we end up with 28.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

On to step 14:
The number 721 fits into 280 0 times, leaving a remainder of 280.
Use 0 as the next digit of our solution. 
Result so far: 29776.68932
Deduct 0 from 280 and we're left with 280.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2800, and continue the process.

On to step 15:
2800 divided by 721 is 3 with a remainder of 637.
Use 3 as the next digit of our solution. 
Result so far: 29776.6893203
The remainder is 637 after subtracting 2163 from 2800.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6370, and continue the process.

Moving on to step 16:
When dividing 6370 by 721, we get 8 with a remainder of 602.
The next digit of our result is 8. 
Result so far: 29776.68932038
The remainder is 602 after subtracting 5768 from 6370.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6020, and continue the process.

After the division, we end up with 29776.68932038 and a remainder of 6.02e-07.