A:
Positive:
1 x 215517197 x 307881719 x 113430149 x 439831133 x 162043343 x 62833931 x 231493307 x 6517
Negative:
-1 x -21551719-7 x -3078817-19 x -1134301-49 x -439831-133 x -162043-343 x -62833-931 x -23149-3307 x -6517
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 21,551,719, 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 | 21,551,719 | |
| -1 | -21,551,719 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 21,551,719.
Example:
1 x 21,551,719 = 21,551,719
and
-1 x -21,551,719 = 21,551,719
Notice both answers equal 21,551,719
With that explanation out of the way, let's continue. Next, we take the number 21,551,719 and divide it by 2:
21,551,719 ÷ 2 = 10,775,859.5
If the quotient is a whole number, then 2 and 10,775,859.5 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 | 21,551,719 | |
| -1 | -21,551,719 |
Now, we try dividing 21,551,719 by 3:
21,551,719 ÷ 3 = 7,183,906.3333
If the quotient is a whole number, then 3 and 7,183,906.3333 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 | 21,551,719 | |
| -1 | -21,551,719 |
Let's try dividing by 4:
21,551,719 ÷ 4 = 5,387,929.75
If the quotient is a whole number, then 4 and 5,387,929.75 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 | 21,551,719 | |
| -1 | 21,551,719 |
If you did it right, you will end up with this table:
| 1 | 7 | 19 | 49 | 133 | 343 | 931 | 3,307 | 6,517 | 23,149 | 62,833 | 162,043 | 439,831 | 1,134,301 | 3,078,817 | 21,551,719 |
| -1 | -7 | -19 | -49 | -133 | -343 | -931 | -3,307 | -6,517 | -23,149 | -62,833 | -162,043 | -439,831 | -1,134,301 | -3,078,817 | -21,551,719 |
Here are some more numbers to try:
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