1, -1, 3, -3, 7, -7, 21, -21
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(21,-1)(7,-3)(-21,1)(-7,3)
The factor pairs of 21 are:1, 213, 7Therefore, the number 21 has two pairs of positive integer factors.
Yes, 1 is a factor of every integer and every integer is a multiple of 1.
It is any fraction of the form (21*k)/(84*k) where k is a non-zero integer, or a common factor of the two.
The absolute value of the integer 21 is 21. The absolute value of something is its distance from 0.