21
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Highest common factor of 273 and 315 is 21.
It is not possible to give a sensible answer to this question. The highest common factor (HCF) refers to a factor that is COMMON to two or more numbers. You have only one number in the question!
13 is the greatest common factor of 208, 221, 234, 247, 260, 273, and 286.
273 / \ 91x3 /\ \ 13x7x3
The common factors of 42 and 273 are 1, 3, 7 and 21.