We look at the division of 45121021 by 127 
We want to figure out the number of times 45121021 can be divided by 127.

On to step 1:
When dividing 4 by 127, we get 0 with a remainder of 4.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 4 and we're left with 4.
Bring next digit (5) of the dividend behind the 4 and repeat the process: 45 / 127

Moving on to step 2:
The number 127 fits into 45 0 times, leaving a remainder of 45.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 45 after subtracting 0 from 45.
Fetch the next digit (1) from the dividend, attach it to 45 and continue: 451 / 127

Step 3:
127 can be fit into 451 3 times, resulting in a remainder of 70.
The next digit of our result is 3. 
Result so far: 3.0
If we subtract 381 from 451, we get 70.
Include the next digit (2) from the dividend after 70, then repeat: 702 / 127

Let's proceed to step 4:
127 can be fit into 702 5 times, resulting in a remainder of 67.
The number 5 becomes the next digit in our result. 
Result so far: 35.0
If we subtract 635 from 702, we get 67.
Grab the next digit (1) from the dividend, add it to 67, then carry on: 671 / 127

Let's proceed to step 5:
671 divided by 127 is 5 with a remainder of 36.
Put 5 as the next digit of the answer. 
Result so far: 355.0
Subtracting 635 from 671 leaves us with 36.
Include the next digit (0) from the dividend after 36, then repeat: 360 / 127

Step 6:
127 can be fit into 360 2 times, resulting in a remainder of 106.
The number 2 becomes the next digit in our result. 
Result so far: 3552.0
Subtracting 254 from 360 leaves us with 106.
Bring next digit (2) of the dividend behind the 106 and repeat the process: 1062 / 127

Step 7:
1062 divided by 127 is 8 with a remainder of 46.
The number 8 becomes the next digit in our result. 
Result so far: 35528.0
If we take 1016 away from 1062, we end up with 46.
Bring next digit (1) of the dividend behind the 46 and repeat the process: 461 / 127

Advancing to step 8:
127 goes into 461 3 times with a remainder of 80.
Put 3 as the next digit of the answer. 
Result so far: 355283.0
The remainder is 80 after subtracting 381 from 461.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

Step 9:
800 divided by 127 is 6 with a remainder of 38.
Record the quotient 6 as the next digit in the result. 
Result so far: 355283.6
If we take 762 away from 800, we end up with 38.
Since there are no more digits in the dividend, we add a zero to the remainder making it 380, and continue the process.

Let's proceed to step 10:
380 divided by 127 is 2 with a remainder of 126.
Put 2 as the next digit of the answer. 
Result so far: 355283.62
Subtracting 254 from 380 leaves us with 126.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1260, and continue the process.

Moving on to step 11:
The number 127 fits into 1260 9 times, leaving a remainder of 117.
Write down 9 as next digit of the result. 
Result so far: 355283.629
If we subtract 1143 from 1260, we get 117.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1170, and continue the process.

Let's proceed to step 12:
The number 127 fits into 1170 9 times, leaving a remainder of 27.
Use 9 as the next digit of our solution. 
Result so far: 355283.6299
If we subtract 1143 from 1170, we get 27.
Since there are no more digits in the dividend, we add a zero to the remainder making it 270, and continue the process.

The final result is 355283.6299 with a remainder of 0.00027.