A:
Positive:
1 x 2145042123 x 93262741 x 52318143 x 498847529 x 40549943 x 22747989 x 216891763 x 12167
Negative:
-1 x -21450421-23 x -932627-41 x -523181-43 x -498847-529 x -40549-943 x -22747-989 x -21689-1763 x -12167
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 21,450,421, 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 | 21,450,421 | |
| -1 | -21,450,421 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 21,450,421.
Example:
1 x 21,450,421 = 21,450,421
and
-1 x -21,450,421 = 21,450,421
Notice both answers equal 21,450,421
With that explanation out of the way, let's continue. Next, we take the number 21,450,421 and divide it by 2:
21,450,421 ÷ 2 = 10,725,210.5
If the quotient is a whole number, then 2 and 10,725,210.5 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 | 21,450,421 | |
| -1 | -21,450,421 |
Now, we try dividing 21,450,421 by 3:
21,450,421 ÷ 3 = 7,150,140.3333
If the quotient is a whole number, then 3 and 7,150,140.3333 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 | 21,450,421 | |
| -1 | -21,450,421 |
Let's try dividing by 4:
21,450,421 ÷ 4 = 5,362,605.25
If the quotient is a whole number, then 4 and 5,362,605.25 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 | 21,450,421 | |
| -1 | 21,450,421 |
If you did it right, you will end up with this table:
| 1 | 23 | 41 | 43 | 529 | 943 | 989 | 1,763 | 12,167 | 21,689 | 22,747 | 40,549 | 498,847 | 523,181 | 932,627 | 21,450,421 |
| -1 | -23 | -41 | -43 | -529 | -943 | -989 | -1,763 | -12,167 | -21,689 | -22,747 | -40,549 | -498,847 | -523,181 | -932,627 | -21,450,421 |
Here are some more numbers to try:
Try the factor calculator