Such a number cannot be quantified. The largest multiple of 84 you can think of can always be increased by 84.
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There is no such number. If X were the largest number divisible by 84 then (X + 84) would be a larger number divisible by 84, contradicting the proposition that X was the largest such number.
7
It is: 21
84 is the mass number: 36 proton plus 48 neutrons
84 is the mass number: 36 proton plus 48 neutrons
x - 84