A:
Positive:
1 x 214241055 x 428482143 x 498235215 x 99647251 x 85355397 x 539651255 x 170711985 x 10793
Negative:
-1 x -21424105-5 x -4284821-43 x -498235-215 x -99647-251 x -85355-397 x -53965-1255 x -17071-1985 x -10793
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 21,424,105, 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 | 21,424,105 | |
| -1 | -21,424,105 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 21,424,105.
Example:
1 x 21,424,105 = 21,424,105
and
-1 x -21,424,105 = 21,424,105
Notice both answers equal 21,424,105
With that explanation out of the way, let's continue. Next, we take the number 21,424,105 and divide it by 2:
21,424,105 ÷ 2 = 10,712,052.5
If the quotient is a whole number, then 2 and 10,712,052.5 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 | 21,424,105 | |
| -1 | -21,424,105 |
Now, we try dividing 21,424,105 by 3:
21,424,105 ÷ 3 = 7,141,368.3333
If the quotient is a whole number, then 3 and 7,141,368.3333 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 | 21,424,105 | |
| -1 | -21,424,105 |
Let's try dividing by 4:
21,424,105 ÷ 4 = 5,356,026.25
If the quotient is a whole number, then 4 and 5,356,026.25 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 | 21,424,105 | |
| -1 | 21,424,105 |
If you did it right, you will end up with this table:
| 1 | 5 | 43 | 215 | 251 | 397 | 1,255 | 1,985 | 10,793 | 17,071 | 53,965 | 85,355 | 99,647 | 498,235 | 4,284,821 | 21,424,105 |
| -1 | -5 | -43 | -215 | -251 | -397 | -1,255 | -1,985 | -10,793 | -17,071 | -53,965 | -85,355 | -99,647 | -498,235 | -4,284,821 | -21,424,105 |
Here are some more numbers to try:
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