A:
Positive:
1 x 217658217 x 310940311 x 197871167 x 32486377 x 282673469 x 46409737 x 295334219 x 5159
Negative:
-1 x -21765821-7 x -3109403-11 x -1978711-67 x -324863-77 x -282673-469 x -46409-737 x -29533-4219 x -5159
Unfortunately, there's not simple formula to identifying all of the factors of a number and it can be a tedious process when trying to identify the divisors of larger numbers. To find the factor combinations of the number 21,765,821, it is easier to work with a table - it's called factoring from the outside in.
We start by creating a table and writing 1 on the left side and then the number we're trying to find the factors for on the right side in a table. Then, below that, write the numbers as a negative as well.
| 1 | 21,765,821 | |
| -1 | -21,765,821 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 21,765,821.
Example:
1 x 21,765,821 = 21,765,821
and
-1 x -21,765,821 = 21,765,821
Notice both answers equal 21,765,821
With that explanation out of the way, let's continue. Next, we take the number 21,765,821 and divide it by 2:
21,765,821 ÷ 2 = 10,882,910.5
If the quotient is a whole number, then 2 and 10,882,910.5 are factors. In this case, the quotient is not a whole number. Don't write anything down and try the next divisor.
Here is what our table should look like at this step:
| 1 | 21,765,821 | |
| -1 | -21,765,821 |
Now, we try dividing 21,765,821 by 3:
21,765,821 ÷ 3 = 7,255,273.6667
If the quotient is a whole number, then 3 and 7,255,273.6667 are factors. In this case, the quotient is not a whole number. Don't write anything down and try the next divisor.
Here is what our table should look like at this step:
| 1 | 21,765,821 | |
| -1 | -21,765,821 |
Let's try dividing by 4:
21,765,821 ÷ 4 = 5,441,455.25
If the quotient is a whole number, then 4 and 5,441,455.25 are factors. In this case, the quotient is not a whole number. Don't write anything down and try the next divisor.
Here is what our table should look like at this step:
| 1 | 21,765,821 | |
| -1 | 21,765,821 |
If you did it right, you will end up with this table:
| 1 | 7 | 11 | 67 | 77 | 469 | 737 | 4,219 | 5,159 | 29,533 | 46,409 | 282,673 | 324,863 | 1,978,711 | 3,109,403 | 21,765,821 |
| -1 | -7 | -11 | -67 | -77 | -469 | -737 | -4,219 | -5,159 | -29,533 | -46,409 | -282,673 | -324,863 | -1,978,711 | -3,109,403 | -21,765,821 |
Here are some more numbers to try:
Try the factor calculator