A:
Positive:
1 x 2110728113 x 162363743 x 49086761 x 346021559 x 37759619 x 34099793 x 266172623 x 8047
Negative:
-1 x -21107281-13 x -1623637-43 x -490867-61 x -346021-559 x -37759-619 x -34099-793 x -26617-2623 x -8047
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 21,107,281, 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 | 21,107,281 | |
| -1 | -21,107,281 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 21,107,281.
Example:
1 x 21,107,281 = 21,107,281
and
-1 x -21,107,281 = 21,107,281
Notice both answers equal 21,107,281
With that explanation out of the way, let's continue. Next, we take the number 21,107,281 and divide it by 2:
21,107,281 ÷ 2 = 10,553,640.5
If the quotient is a whole number, then 2 and 10,553,640.5 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 | 21,107,281 | |
| -1 | -21,107,281 |
Now, we try dividing 21,107,281 by 3:
21,107,281 ÷ 3 = 7,035,760.3333
If the quotient is a whole number, then 3 and 7,035,760.3333 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 | 21,107,281 | |
| -1 | -21,107,281 |
Let's try dividing by 4:
21,107,281 ÷ 4 = 5,276,820.25
If the quotient is a whole number, then 4 and 5,276,820.25 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 | 21,107,281 | |
| -1 | 21,107,281 |
If you did it right, you will end up with this table:
| 1 | 13 | 43 | 61 | 559 | 619 | 793 | 2,623 | 8,047 | 26,617 | 34,099 | 37,759 | 346,021 | 490,867 | 1,623,637 | 21,107,281 |
| -1 | -13 | -43 | -61 | -559 | -619 | -793 | -2,623 | -8,047 | -26,617 | -34,099 | -37,759 | -346,021 | -490,867 | -1,623,637 | -21,107,281 |
Here are some more numbers to try:
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