A:
Positive:
1 x 212734137 x 303905923 x 924931161 x 132133229 x 92897577 x 368691603 x 132714039 x 5267
Negative:
-1 x -21273413-7 x -3039059-23 x -924931-161 x -132133-229 x -92897-577 x -36869-1603 x -13271-4039 x -5267
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 21,273,413, 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 | 21,273,413 | |
| -1 | -21,273,413 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 21,273,413.
Example:
1 x 21,273,413 = 21,273,413
and
-1 x -21,273,413 = 21,273,413
Notice both answers equal 21,273,413
With that explanation out of the way, let's continue. Next, we take the number 21,273,413 and divide it by 2:
21,273,413 ÷ 2 = 10,636,706.5
If the quotient is a whole number, then 2 and 10,636,706.5 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 | 21,273,413 | |
| -1 | -21,273,413 |
Now, we try dividing 21,273,413 by 3:
21,273,413 ÷ 3 = 7,091,137.6667
If the quotient is a whole number, then 3 and 7,091,137.6667 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 | 21,273,413 | |
| -1 | -21,273,413 |
Let's try dividing by 4:
21,273,413 ÷ 4 = 5,318,353.25
If the quotient is a whole number, then 4 and 5,318,353.25 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 | 21,273,413 | |
| -1 | 21,273,413 |
If you did it right, you will end up with this table:
| 1 | 7 | 23 | 161 | 229 | 577 | 1,603 | 4,039 | 5,267 | 13,271 | 36,869 | 92,897 | 132,133 | 924,931 | 3,039,059 | 21,273,413 |
| -1 | -7 | -23 | -161 | -229 | -577 | -1,603 | -4,039 | -5,267 | -13,271 | -36,869 | -92,897 | -132,133 | -924,931 | -3,039,059 | -21,273,413 |
Here are some more numbers to try:
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