A:
Positive:
1 x 218190077 x 311700117 x 1283471119 x 183353181 x 1205471013 x 215391267 x 172213077 x 7091
Negative:
-1 x -21819007-7 x -3117001-17 x -1283471-119 x -183353-181 x -120547-1013 x -21539-1267 x -17221-3077 x -7091
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 21,819,007, 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 | 21,819,007 | |
| -1 | -21,819,007 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 21,819,007.
Example:
1 x 21,819,007 = 21,819,007
and
-1 x -21,819,007 = 21,819,007
Notice both answers equal 21,819,007
With that explanation out of the way, let's continue. Next, we take the number 21,819,007 and divide it by 2:
21,819,007 ÷ 2 = 10,909,503.5
If the quotient is a whole number, then 2 and 10,909,503.5 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 | 21,819,007 | |
| -1 | -21,819,007 |
Now, we try dividing 21,819,007 by 3:
21,819,007 ÷ 3 = 7,273,002.3333
If the quotient is a whole number, then 3 and 7,273,002.3333 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 | 21,819,007 | |
| -1 | -21,819,007 |
Let's try dividing by 4:
21,819,007 ÷ 4 = 5,454,751.75
If the quotient is a whole number, then 4 and 5,454,751.75 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 | 21,819,007 | |
| -1 | 21,819,007 |
If you did it right, you will end up with this table:
| 1 | 7 | 17 | 119 | 181 | 1,013 | 1,267 | 3,077 | 7,091 | 17,221 | 21,539 | 120,547 | 183,353 | 1,283,471 | 3,117,001 | 21,819,007 |
| -1 | -7 | -17 | -119 | -181 | -1,013 | -1,267 | -3,077 | -7,091 | -17,221 | -21,539 | -120,547 | -183,353 | -1,283,471 | -3,117,001 | -21,819,007 |
Here are some more numbers to try:
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