A:
Positive:
1 x 213401237 x 304858959 x 361697163 x 130921317 x 67319413 x 516711141 x 187032219 x 9617
Negative:
-1 x -21340123-7 x -3048589-59 x -361697-163 x -130921-317 x -67319-413 x -51671-1141 x -18703-2219 x -9617
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 21,340,123, 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 | 21,340,123 | |
| -1 | -21,340,123 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 21,340,123.
Example:
1 x 21,340,123 = 21,340,123
and
-1 x -21,340,123 = 21,340,123
Notice both answers equal 21,340,123
With that explanation out of the way, let's continue. Next, we take the number 21,340,123 and divide it by 2:
21,340,123 ÷ 2 = 10,670,061.5
If the quotient is a whole number, then 2 and 10,670,061.5 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 | 21,340,123 | |
| -1 | -21,340,123 |
Now, we try dividing 21,340,123 by 3:
21,340,123 ÷ 3 = 7,113,374.3333
If the quotient is a whole number, then 3 and 7,113,374.3333 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 | 21,340,123 | |
| -1 | -21,340,123 |
Let's try dividing by 4:
21,340,123 ÷ 4 = 5,335,030.75
If the quotient is a whole number, then 4 and 5,335,030.75 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 | 21,340,123 | |
| -1 | 21,340,123 |
If you did it right, you will end up with this table:
| 1 | 7 | 59 | 163 | 317 | 413 | 1,141 | 2,219 | 9,617 | 18,703 | 51,671 | 67,319 | 130,921 | 361,697 | 3,048,589 | 21,340,123 |
| -1 | -7 | -59 | -163 | -317 | -413 | -1,141 | -2,219 | -9,617 | -18,703 | -51,671 | -67,319 | -130,921 | -361,697 | -3,048,589 | -21,340,123 |
Here are some more numbers to try:
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