There is no such number. Since 4 more than that number would be a higher multiple. And 4 more than THAT number would be a higher multiple still. And so on.
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lim_{n \to \infty} 12n = \infty
Highest common multiple of 24 and 18 is 6.
There is no highest common multiple. Whatever common multiple you come up with as being their highest common multiple, I can always add their lowest common multiple (120) to get a higher common multiple.
This cannot be determined because the common multiples of any two or more numbers are infinite.
It is infinite