This answer can't be calculated. There is no number so high that one can't add 28 to it.
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The common multiples of 21 and 28 are 84, 168, 252, 336, ... and so on, never ending; so there is no real Highest Common Multiple.Do you mean:Highest Common Factor - the highest number which divides both 21 and 28 which is 7; orLowest Common Multiple - the lowest number which is a multiple of both 21 and 28 which is 84.
The highest common multiple of any set of integers is infinite.
The highest common multiple of any set of integers is infinite.
There is no limit to the size of the highest common multiple. Highest common factor is 2 and lowest common multiple is 176.
The least common multiple of 7 and 28 is 28.