21605479 divided by 509 
Let's see how many times 509 fits into 21605479.

Advancing to step 1:
509 goes into 2 0 times with a remainder of 2.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 2 to get 2.
Fetch the next digit (1) from the dividend, attach it to 2 and continue: 21 / 509

Moving on to step 2:
509 can be fit into 21 0 times, resulting in a remainder of 21.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 21, we end up with 21.
Append the next digit (6) from the dividend to 21 and continue with: 216 / 509

Advancing to step 3:
509 goes into 216 0 times with a remainder of 216.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 216 after subtracting 0 from 216.
Fetch the next digit (0) from the dividend, attach it to 216 and continue: 2160 / 509

Step 4:
The number 509 fits into 2160 4 times, leaving a remainder of 124.
Record the quotient 4 as the next digit in the result. 
Result so far: 4.0
If we take 2036 away from 2160, we end up with 124.
Grab the next digit (5) from the dividend, add it to 124, then carry on: 1245 / 509

Step 5:
1245 divided by 509 is 2 with a remainder of 227.
Use 2 as the next digit of our solution. 
Result so far: 42.0
The remainder is 227 after subtracting 1018 from 1245.
Bring next digit (4) of the dividend behind the 227 and repeat the process: 2274 / 509

Let's proceed to step 6:
The number 509 fits into 2274 4 times, leaving a remainder of 238.
Put 4 as the next digit of the answer. 
Result so far: 424.0
Subtract 2036 from 2274 to get 238.
Fetch the next digit (7) from the dividend, attach it to 238 and continue: 2387 / 509

Advancing to step 7:
When dividing 2387 by 509, we get 4 with a remainder of 351.
Use 4 as the next digit of our solution. 
Result so far: 4244.0
Subtracting 2036 from 2387 leaves us with 351.
Include the next digit (9) from the dividend after 351, then repeat: 3519 / 509

Let's proceed to step 8:
If we divide 3519 by 509, we get 6 and a remainder of 465.
Record the quotient 6 as the next digit in the result. 
Result so far: 42446.0
Subtracting 3054 from 3519 leaves us with 465.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4650, and continue the process.

Going ahead to step 9:
The number 509 fits into 4650 9 times, leaving a remainder of 69.
Put 9 as the next digit of the answer. 
Result so far: 42446.9
Subtract 4581 from 4650 to get 69.
Since there are no more digits in the dividend, we add a zero to the remainder making it 690, and continue the process.

Moving on to step 10:
If we divide 690 by 509, we get 1 and a remainder of 181.
Put 1 as the next digit of the answer. 
Result so far: 42446.91
Subtract 509 from 690 to get 181.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1810, and continue the process.

Let's proceed to step 11:
The number 509 fits into 1810 3 times, leaving a remainder of 283.
The next digit of our result is 3. 
Result so far: 42446.913
Subtracting 1527 from 1810 leaves us with 283.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2830, and continue the process.

Step 12:
509 goes into 2830 5 times with a remainder of 285.
Record the quotient 5 as the next digit in the result. 
Result so far: 42446.9135
If we take 2545 away from 2830, we end up with 285.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2850, and continue the process.

Going ahead to step 13:
509 goes into 2850 5 times with a remainder of 305.
Use 5 as the next digit of our solution. 
Result so far: 42446.91355
If we take 2545 away from 2850, we end up with 305.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3050, and continue the process.

After the division, we end up with 42446.91355 and a remainder of 0.000305.