A:
Positive:
1 x 213542155 x 427084347 x 45434589 x 239935235 x 90869445 x 479871021 x 209154183 x 5105
Negative:
-1 x -21354215-5 x -4270843-47 x -454345-89 x -239935-235 x -90869-445 x -47987-1021 x -20915-4183 x -5105
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 21,354,215, 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 | 21,354,215 | |
| -1 | -21,354,215 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 21,354,215.
Example:
1 x 21,354,215 = 21,354,215
and
-1 x -21,354,215 = 21,354,215
Notice both answers equal 21,354,215
With that explanation out of the way, let's continue. Next, we take the number 21,354,215 and divide it by 2:
21,354,215 ÷ 2 = 10,677,107.5
If the quotient is a whole number, then 2 and 10,677,107.5 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 | 21,354,215 | |
| -1 | -21,354,215 |
Now, we try dividing 21,354,215 by 3:
21,354,215 ÷ 3 = 7,118,071.6667
If the quotient is a whole number, then 3 and 7,118,071.6667 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 | 21,354,215 | |
| -1 | -21,354,215 |
Let's try dividing by 4:
21,354,215 ÷ 4 = 5,338,553.75
If the quotient is a whole number, then 4 and 5,338,553.75 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 | 21,354,215 | |
| -1 | 21,354,215 |
If you did it right, you will end up with this table:
| 1 | 5 | 47 | 89 | 235 | 445 | 1,021 | 4,183 | 5,105 | 20,915 | 47,987 | 90,869 | 239,935 | 454,345 | 4,270,843 | 21,354,215 |
| -1 | -5 | -47 | -89 | -235 | -445 | -1,021 | -4,183 | -5,105 | -20,915 | -47,987 | -90,869 | -239,935 | -454,345 | -4,270,843 | -21,354,215 |
Here are some more numbers to try:
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