We look at the division of 21529421 by 487 
We're looking to find how many times 487 goes into 21529421.

On to step 1:
487 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
If we take 0 away from 2, we end up with 2.
Fetch the next digit (1) from the dividend, attach it to 2 and continue: 21 / 487

Moving on to step 2:
487 goes into 21 0 times with a remainder of 21.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 21 and we're left with 21.
Include the next digit (5) from the dividend after 21, then repeat: 215 / 487

Let's proceed to step 3:
487 can be fit into 215 0 times, resulting in a remainder of 215.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 215 and we're left with 215.
Fetch the next digit (2) from the dividend, attach it to 215 and continue: 2152 / 487

Step 4:
487 can be fit into 2152 4 times, resulting in a remainder of 204.
Use 4 as the next digit of our solution. 
Result so far: 4.0
Subtract 1948 from 2152 to get 204.
Grab the next digit (9) from the dividend, add it to 204, then carry on: 2049 / 487

Let's proceed to step 5:
If we divide 2049 by 487, we get 4 and a remainder of 101.
Put 4 as the next digit of the answer. 
Result so far: 44.0
Subtract 1948 from 2049 to get 101.
Include the next digit (4) from the dividend after 101, then repeat: 1014 / 487

Going ahead to step 6:
When dividing 1014 by 487, we get 2 with a remainder of 40.
The next digit of our result is 2. 
Result so far: 442.0
Subtracting 974 from 1014 leaves us with 40.
Include the next digit (2) from the dividend after 40, then repeat: 402 / 487

Step 7:
402 divided by 487 is 0 with a remainder of 402.
Use 0 as the next digit of our solution. 
Result so far: 4420.0
The remainder is 402 after subtracting 0 from 402.
Take the next digit (1) from the dividend and append it to 402, then repeat: 4021 / 487

Moving on to step 8:
The number 487 fits into 4021 8 times, leaving a remainder of 125.
Write down 8 as next digit of the result. 
Result so far: 44208.0
Subtract 3896 from 4021 to get 125.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1250, and continue the process.

Let's proceed to step 9:
When dividing 1250 by 487, we get 2 with a remainder of 276.
Write down 2 as next digit of the result. 
Result so far: 44208.2
The remainder is 276 after subtracting 974 from 1250.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2760, and continue the process.

Going ahead to step 10:
When dividing 2760 by 487, we get 5 with a remainder of 325.
Use 5 as the next digit of our solution. 
Result so far: 44208.25
Subtract 2435 from 2760 to get 325.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3250, and continue the process.

Let's proceed to step 11:
The number 487 fits into 3250 6 times, leaving a remainder of 328.
Record the quotient 6 as the next digit in the result. 
Result so far: 44208.256
If we subtract 2922 from 3250, we get 328.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3280, and continue the process.

Advancing to step 12:
The number 487 fits into 3280 6 times, leaving a remainder of 358.
Write down 6 as next digit of the result. 
Result so far: 44208.2566
Deduct 2922 from 3280 and we're left with 358.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3580, and continue the process.

The final result is 44208.2566 with a remainder of 0.00358.