A:
Positive:
1 x 2113021911 x 192092937 x 571087193 x 109483269 x 78551407 x 519172123 x 99532959 x 7141
Negative:
-1 x -21130219-11 x -1920929-37 x -571087-193 x -109483-269 x -78551-407 x -51917-2123 x -9953-2959 x -7141
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 21,130,219, 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 | 21,130,219 | |
| -1 | -21,130,219 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 21,130,219.
Example:
1 x 21,130,219 = 21,130,219
and
-1 x -21,130,219 = 21,130,219
Notice both answers equal 21,130,219
With that explanation out of the way, let's continue. Next, we take the number 21,130,219 and divide it by 2:
21,130,219 ÷ 2 = 10,565,109.5
If the quotient is a whole number, then 2 and 10,565,109.5 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 | 21,130,219 | |
| -1 | -21,130,219 |
Now, we try dividing 21,130,219 by 3:
21,130,219 ÷ 3 = 7,043,406.3333
If the quotient is a whole number, then 3 and 7,043,406.3333 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 | 21,130,219 | |
| -1 | -21,130,219 |
Let's try dividing by 4:
21,130,219 ÷ 4 = 5,282,554.75
If the quotient is a whole number, then 4 and 5,282,554.75 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 | 21,130,219 | |
| -1 | 21,130,219 |
If you did it right, you will end up with this table:
| 1 | 11 | 37 | 193 | 269 | 407 | 2,123 | 2,959 | 7,141 | 9,953 | 51,917 | 78,551 | 109,483 | 571,087 | 1,920,929 | 21,130,219 |
| -1 | -11 | -37 | -193 | -269 | -407 | -2,123 | -2,959 | -7,141 | -9,953 | -51,917 | -78,551 | -109,483 | -571,087 | -1,920,929 | -21,130,219 |
Here are some more numbers to try:
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