A:
Positive:
1 x 211032437 x 301474919 x 1110697101 x 208943133 x 158671707 x 298491571 x 134331919 x 10997
Negative:
-1 x -21103243-7 x -3014749-19 x -1110697-101 x -208943-133 x -158671-707 x -29849-1571 x -13433-1919 x -10997
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 21,103,243, 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 | 21,103,243 | |
| -1 | -21,103,243 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 21,103,243.
Example:
1 x 21,103,243 = 21,103,243
and
-1 x -21,103,243 = 21,103,243
Notice both answers equal 21,103,243
With that explanation out of the way, let's continue. Next, we take the number 21,103,243 and divide it by 2:
21,103,243 ÷ 2 = 10,551,621.5
If the quotient is a whole number, then 2 and 10,551,621.5 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 | 21,103,243 | |
| -1 | -21,103,243 |
Now, we try dividing 21,103,243 by 3:
21,103,243 ÷ 3 = 7,034,414.3333
If the quotient is a whole number, then 3 and 7,034,414.3333 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 | 21,103,243 | |
| -1 | -21,103,243 |
Let's try dividing by 4:
21,103,243 ÷ 4 = 5,275,810.75
If the quotient is a whole number, then 4 and 5,275,810.75 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 | 21,103,243 | |
| -1 | 21,103,243 |
If you did it right, you will end up with this table:
| 1 | 7 | 19 | 101 | 133 | 707 | 1,571 | 1,919 | 10,997 | 13,433 | 29,849 | 158,671 | 208,943 | 1,110,697 | 3,014,749 | 21,103,243 |
| -1 | -7 | -19 | -101 | -133 | -707 | -1,571 | -1,919 | -10,997 | -13,433 | -29,849 | -158,671 | -208,943 | -1,110,697 | -3,014,749 | -21,103,243 |
Here are some more numbers to try:
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