Let's divide 21022521 by 522
We want to figure out the number of times 21022521 can be divided by 522.

On to step 1:
522 can be fit into 2 0 times, resulting in a remainder of 2.
The next digit of our result is 0. 
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 / 522

Advancing to step 2:
If we divide 21 by 522, we get 0 and a remainder of 21.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 21 to get 21.
Bring next digit (0) of the dividend behind the 21 and repeat the process: 210 / 522

Step 3:
522 can be fit into 210 0 times, resulting in a remainder of 210.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 210 leaves us with 210.
Take the next digit (2) from the dividend and append it to 210, then repeat: 2102 / 522

Step 4:
If we divide 2102 by 522, we get 4 and a remainder of 14.
Record the quotient 4 as the next digit in the result. 
Result so far: 4.0
The remainder is 14 after subtracting 2088 from 2102.
Include the next digit (2) from the dividend after 14, then repeat: 142 / 522

Advancing to step 5:
142 divided by 522 is 0 with a remainder of 142.
Use 0 as the next digit of our solution. 
Result so far: 40.0
The remainder is 142 after subtracting 0 from 142.
Grab the next digit (5) from the dividend, add it to 142, then carry on: 1425 / 522

Going ahead to step 6:
522 goes into 1425 2 times with a remainder of 381.
Record the quotient 2 as the next digit in the result. 
Result so far: 402.0
Subtract 1044 from 1425 to get 381.
Fetch the next digit (2) from the dividend, attach it to 381 and continue: 3812 / 522

Going ahead to step 7:
522 can be fit into 3812 7 times, resulting in a remainder of 158.
Record the quotient 7 as the next digit in the result. 
Result so far: 4027.0
If we take 3654 away from 3812, we end up with 158.
Take the next digit (1) from the dividend and append it to 158, then repeat: 1581 / 522

Step 8:
1581 divided by 522 is 3 with a remainder of 15.
Put 3 as the next digit of the answer. 
Result so far: 40273.0
If we subtract 1566 from 1581, we get 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Advancing to step 9:
When dividing 150 by 522, we get 0 with a remainder of 150.
Use 0 as the next digit of our solution. 
Result so far: 40273.0
Subtract 0 from 150 to get 150.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1500, and continue the process.

On to step 10:
If we divide 1500 by 522, we get 2 and a remainder of 456.
The next digit of our result is 2. 
Result so far: 40273.02
Subtract 1044 from 1500 to get 456.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4560, and continue the process.

Step 11:
522 can be fit into 4560 8 times, resulting in a remainder of 384.
Use 8 as the next digit of our solution. 
Result so far: 40273.028
Deduct 4176 from 4560 and we're left with 384.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3840, and continue the process.

Going ahead to step 12:
522 goes into 3840 7 times with a remainder of 186.
Record the quotient 7 as the next digit in the result. 
Result so far: 40273.0287
The remainder is 186 after subtracting 3654 from 3840.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1860, and continue the process.

Going ahead to step 13:
When dividing 1860 by 522, we get 3 with a remainder of 294.
Write down 3 as next digit of the result. 
Result so far: 40273.02873
The remainder is 294 after subtracting 1566 from 1860.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2940, and continue the process.

Going ahead to step 14:
522 goes into 2940 5 times with a remainder of 330.
Write down 5 as next digit of the result. 
Result so far: 40273.028735
Subtract 2610 from 2940 to get 330.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3300, and continue the process.

Let's proceed to step 15:
The number 522 fits into 3300 6 times, leaving a remainder of 168.
Write down 6 as next digit of the result. 
Result so far: 40273.0287356
Subtract 3132 from 3300 to get 168.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1680, and continue the process.

Moving on to step 16:
1680 divided by 522 is 3 with a remainder of 114.
Use 3 as the next digit of our solution. 
Result so far: 40273.02873563
The remainder is 114 after subtracting 1566 from 1680.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1140, and continue the process.

The final outcome is 40273.02873563, with a leftover of 1.14e-07.