42164446 ÷ 721 
We're looking to find how many times 721 goes into 42164446.

Advancing to step 1:
721 goes into 4 0 times with a remainder of 4.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 4 and we're left with 4.
Include the next digit (2) from the dividend after 4, then repeat: 42 / 721

Going ahead to step 2:
If we divide 42 by 721, we get 0 and a remainder of 42.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 42 and we're left with 42.
Include the next digit (1) from the dividend after 42, then repeat: 421 / 721

On to step 3:
If we divide 421 by 721, we get 0 and a remainder of 421.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 421 after subtracting 0 from 421.
Append the next digit (6) from the dividend to 421 and continue with: 4216 / 721

Let's proceed to step 4:
4216 divided by 721 is 5 with a remainder of 611.
The number 5 becomes the next digit in our result. 
Result so far: 5.0
Deduct 3605 from 4216 and we're left with 611.
Grab the next digit (4) from the dividend, add it to 611, then carry on: 6114 / 721

Going ahead to step 5:
If we divide 6114 by 721, we get 8 and a remainder of 346.
The next digit of our result is 8. 
Result so far: 58.0
Deduct 5768 from 6114 and we're left with 346.
Append the next digit (4) from the dividend to 346 and continue with: 3464 / 721

Advancing to step 6:
If we divide 3464 by 721, we get 4 and a remainder of 580.
Use 4 as the next digit of our solution. 
Result so far: 584.0
Subtract 2884 from 3464 to get 580.
Bring next digit (4) of the dividend behind the 580 and repeat the process: 5804 / 721

On to step 7:
721 can be fit into 5804 8 times, resulting in a remainder of 36.
Write down 8 as next digit of the result. 
Result so far: 5848.0
Deduct 5768 from 5804 and we're left with 36.
Take the next digit (6) from the dividend and append it to 36, then repeat: 366 / 721

Going ahead to step 8:
366 divided by 721 is 0 with a remainder of 366.
Put 0 as the next digit of the answer. 
Result so far: 58480.0
Subtracting 0 from 366 leaves us with 366.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3660, and continue the process.

Step 9:
3660 divided by 721 is 5 with a remainder of 55.
Write down 5 as next digit of the result. 
Result so far: 58480.5
If we take 3605 away from 3660, we end up with 55.
Since there are no more digits in the dividend, we add a zero to the remainder making it 550, and continue the process.

Going ahead to step 10:
When dividing 550 by 721, we get 0 with a remainder of 550.
The next digit of our result is 0. 
Result so far: 58480.5
Deduct 0 from 550 and we're left with 550.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5500, and continue the process.

Going ahead to step 11:
When dividing 5500 by 721, we get 7 with a remainder of 453.
Put 7 as the next digit of the answer. 
Result so far: 58480.507
Deduct 5047 from 5500 and we're left with 453.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4530, and continue the process.

Moving on to step 12:
The number 721 fits into 4530 6 times, leaving a remainder of 204.
The number 6 becomes the next digit in our result. 
Result so far: 58480.5076
Subtracting 4326 from 4530 leaves us with 204.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2040, and continue the process.

Step 13:
If we divide 2040 by 721, we get 2 and a remainder of 598.
Write down 2 as next digit of the result. 
Result so far: 58480.50762
Deduct 1442 from 2040 and we're left with 598.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5980, and continue the process.

Going ahead to step 14:
721 can be fit into 5980 8 times, resulting in a remainder of 212.
Record the quotient 8 as the next digit in the result. 
Result so far: 58480.507628
Subtract 5768 from 5980 to get 212.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2120, and continue the process.

Moving on to step 15:
When dividing 2120 by 721, we get 2 with a remainder of 678.
Use 2 as the next digit of our solution. 
Result so far: 58480.5076282
The remainder is 678 after subtracting 1442 from 2120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6780, and continue the process.

On to step 16:
The number 721 fits into 6780 9 times, leaving a remainder of 291.
The next digit of our result is 9. 
Result so far: 58480.50762829
If we take 6489 away from 6780, we end up with 291.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2910, and continue the process.

The final outcome is 58480.50762829, with a leftover of 2.91e-07.