I think the answer is zero.
The only 15 consecutive integers whose average is 7 are the integers 0,1,2,3,4,5,6,7,8,9,10,11,12,13,14. For any odd number of consecutive integers the average will be equal to the middle number, and this is the only group of 15 consecutive integers with 7 as the middle number. The product of any group of numbers that includes 0 will always be 0 because 0 times anything is 0.
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There are no two consecutive integers whose product is 421 - the product of 20 and 21 is 420.
There are no two consecutive integers, negative or positive, whose product is 440.
They are: 40*41 = 1640
11 and 13
-13*-14 = 182