21073045 divided by 45 
We're looking to find how many times 45 goes into 21073045.

Going ahead to step 1:
When dividing 2 by 45, we get 0 with a remainder of 2.
Write down 0 as next digit of the result. 
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 / 45

Step 2:
45 goes into 21 0 times with a remainder of 21.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 21 after subtracting 0 from 21.
Include the next digit (0) from the dividend after 21, then repeat: 210 / 45

Moving on to step 3:
The number 45 fits into 210 4 times, leaving a remainder of 30.
Use 4 as the next digit of our solution. 
Result so far: 4.0
The remainder is 30 after subtracting 180 from 210.
Take the next digit (7) from the dividend and append it to 30, then repeat: 307 / 45

On to step 4:
45 goes into 307 6 times with a remainder of 37.
Use 6 as the next digit of our solution. 
Result so far: 46.0
Subtracting 270 from 307 leaves us with 37.
Grab the next digit (3) from the dividend, add it to 37, then carry on: 373 / 45

Advancing to step 5:
The number 45 fits into 373 8 times, leaving a remainder of 13.
Record the quotient 8 as the next digit in the result. 
Result so far: 468.0
If we take 360 away from 373, we end up with 13.
Take the next digit (0) from the dividend and append it to 13, then repeat: 130 / 45

Step 6:
If we divide 130 by 45, we get 2 and a remainder of 40.
Put 2 as the next digit of the answer. 
Result so far: 4682.0
Deduct 90 from 130 and we're left with 40.
Include the next digit (4) from the dividend after 40, then repeat: 404 / 45

Let's proceed to step 7:
When dividing 404 by 45, we get 8 with a remainder of 44.
Record the quotient 8 as the next digit in the result. 
Result so far: 46828.0
Subtracting 360 from 404 leaves us with 44.
Include the next digit (5) from the dividend after 44, then repeat: 445 / 45

Going ahead to step 8:
45 goes into 445 9 times with a remainder of 40.
Use 9 as the next digit of our solution. 
Result so far: 468289.0
If we take 405 away from 445, we end up 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.

Step 9:
The number 45 fits into 400 8 times, leaving a remainder of 40.
The next digit of our result is 8. 
Result so far: 468289.8
Deduct 360 from 400 and we're left 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.

Step 10:
45 goes into 400 8 times with a remainder of 40.
Use 8 as the next digit of our solution. 
Result so far: 468289.88
The remainder is 40 after subtracting 360 from 400.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

After the division, we end up with 468289.88 and a remainder of 0.04.