21209779 ÷ 987 
We're looking to find how many times 987 goes into 21209779.

Advancing to step 1:
When dividing 2 by 987, we get 0 with a remainder of 2.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 2 and we're left with 2.
Take the next digit (1) from the dividend and append it to 2, then repeat: 21 / 987

Step 2:
21 divided by 987 is 0 with a remainder of 21.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 21 leaves us with 21.
Bring next digit (2) of the dividend behind the 21 and repeat the process: 212 / 987

Moving on to step 3:
When dividing 212 by 987, we get 0 with a remainder of 212.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 212, we get 212.
Bring next digit (0) of the dividend behind the 212 and repeat the process: 2120 / 987

Moving on to step 4:
If we divide 2120 by 987, we get 2 and a remainder of 146.
Put 2 as the next digit of the answer. 
Result so far: 2.0
Deduct 1974 from 2120 and we're left with 146.
Take the next digit (9) from the dividend and append it to 146, then repeat: 1469 / 987

Let's proceed to step 5:
1469 divided by 987 is 1 with a remainder of 482.
The number 1 becomes the next digit in our result. 
Result so far: 21.0
Deduct 987 from 1469 and we're left with 482.
Fetch the next digit (7) from the dividend, attach it to 482 and continue: 4827 / 987

Moving on to step 6:
987 can be fit into 4827 4 times, resulting in a remainder of 879.
Put 4 as the next digit of the answer. 
Result so far: 214.0
Deduct 3948 from 4827 and we're left with 879.
Take the next digit (7) from the dividend and append it to 879, then repeat: 8797 / 987

Moving on to step 7:
The number 987 fits into 8797 8 times, leaving a remainder of 901.
The next digit of our result is 8. 
Result so far: 2148.0
Deduct 7896 from 8797 and we're left with 901.
Bring next digit (9) of the dividend behind the 901 and repeat the process: 9019 / 987

Step 8:
987 goes into 9019 9 times with a remainder of 136.
The number 9 becomes the next digit in our result. 
Result so far: 21489.0
Subtracting 8883 from 9019 leaves us with 136.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1360, and continue the process.

Moving on to step 9:
The number 987 fits into 1360 1 times, leaving a remainder of 373.
Use 1 as the next digit of our solution. 
Result so far: 21489.1
Subtracting 987 from 1360 leaves us with 373.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3730, and continue the process.

Advancing to step 10:
When dividing 3730 by 987, we get 3 with a remainder of 769.
The number 3 becomes the next digit in our result. 
Result so far: 21489.13
Deduct 2961 from 3730 and we're left with 769.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7690, and continue the process.

Step 11:
987 goes into 7690 7 times with a remainder of 781.
Use 7 as the next digit of our solution. 
Result so far: 21489.137
Deduct 6909 from 7690 and we're left with 781.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7810, and continue the process.

On to step 12:
When dividing 7810 by 987, we get 7 with a remainder of 901.
Write down 7 as next digit of the result. 
Result so far: 21489.1377
The remainder is 901 after subtracting 6909 from 7810.
Since there are no more digits in the dividend, we add a zero to the remainder making it 9010, and continue the process.

After the division, we end up with 21489.1377 and a remainder of 0.00901.