A:
Positive:
1 x 212103955 x 424207943 x 49326547 x 451285215 x 98653235 x 902572021 x 104952099 x 10105
Negative:
-1 x -21210395-5 x -4242079-43 x -493265-47 x -451285-215 x -98653-235 x -90257-2021 x -10495-2099 x -10105
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 21,210,395, 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 | 21,210,395 | |
| -1 | -21,210,395 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 21,210,395.
Example:
1 x 21,210,395 = 21,210,395
and
-1 x -21,210,395 = 21,210,395
Notice both answers equal 21,210,395
With that explanation out of the way, let's continue. Next, we take the number 21,210,395 and divide it by 2:
21,210,395 ÷ 2 = 10,605,197.5
If the quotient is a whole number, then 2 and 10,605,197.5 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 | 21,210,395 | |
| -1 | -21,210,395 |
Now, we try dividing 21,210,395 by 3:
21,210,395 ÷ 3 = 7,070,131.6667
If the quotient is a whole number, then 3 and 7,070,131.6667 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 | 21,210,395 | |
| -1 | -21,210,395 |
Let's try dividing by 4:
21,210,395 ÷ 4 = 5,302,598.75
If the quotient is a whole number, then 4 and 5,302,598.75 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 | 21,210,395 | |
| -1 | 21,210,395 |
If you did it right, you will end up with this table:
| 1 | 5 | 43 | 47 | 215 | 235 | 2,021 | 2,099 | 10,105 | 10,495 | 90,257 | 98,653 | 451,285 | 493,265 | 4,242,079 | 21,210,395 |
| -1 | -5 | -43 | -47 | -215 | -235 | -2,021 | -2,099 | -10,105 | -10,495 | -90,257 | -98,653 | -451,285 | -493,265 | -4,242,079 | -21,210,395 |
Here are some more numbers to try:
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