What is the product of any integer and –1?

The integer's opposite form meaning if you multiply a negative integer with -1, you get the same integer in its positive form.
Ex: -2 x -1 = 2
If you multiply a positive integer with -1, you get the same integer in its positive form.
Ex: 2 x -1 = -2

21 because hes a savage and is apart of slaughter gang