A:
Positive:
1 x 212802597 x 304003711 x 193456913 x 163694349 x 43429177 x 27636791 x 233849143 x 148813539 x 39481637 x 334071001 x 212593037 x 7007
Negative:
-1 x -21280259-7 x -3040037-11 x -1934569-13 x -1636943-49 x -434291-77 x -276367-91 x -233849-143 x -148813-539 x -39481-637 x -33407-1001 x -21259-3037 x -7007
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 21,280,259, 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 | 21,280,259 | |
| -1 | -21,280,259 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 21,280,259.
Example:
1 x 21,280,259 = 21,280,259
and
-1 x -21,280,259 = 21,280,259
Notice both answers equal 21,280,259
With that explanation out of the way, let's continue. Next, we take the number 21,280,259 and divide it by 2:
21,280,259 ÷ 2 = 10,640,129.5
If the quotient is a whole number, then 2 and 10,640,129.5 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 | 21,280,259 | |
| -1 | -21,280,259 |
Now, we try dividing 21,280,259 by 3:
21,280,259 ÷ 3 = 7,093,419.6667
If the quotient is a whole number, then 3 and 7,093,419.6667 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 | 21,280,259 | |
| -1 | -21,280,259 |
Let's try dividing by 4:
21,280,259 ÷ 4 = 5,320,064.75
If the quotient is a whole number, then 4 and 5,320,064.75 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 | 21,280,259 | |
| -1 | 21,280,259 |
If you did it right, you will end up with this table:
| 1 | 7 | 11 | 13 | 49 | 77 | 91 | 143 | 539 | 637 | 1,001 | 3,037 | 7,007 | 21,259 | 33,407 | 39,481 | 148,813 | 233,849 | 276,367 | 434,291 | 1,636,943 | 1,934,569 | 3,040,037 | 21,280,259 |
| -1 | -7 | -11 | -13 | -49 | -77 | -91 | -143 | -539 | -637 | -1,001 | -3,037 | -7,007 | -21,259 | -33,407 | -39,481 | -148,813 | -233,849 | -276,367 | -434,291 | -1,636,943 | -1,934,569 | -3,040,037 | -21,280,259 |
Here are some more numbers to try:
Try the factor calculator