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The Highest Common Factor (HCF) of 21, 77, and 84 is 7. To find the HCF, you need to identify the common factors of the numbers and determine the highest one they all share. In this case, the factors of 21 are 1, 3, 7, 21; the factors of 77 are 1, 7, 11, 77; and the factors of 84 are 1, 2, 3, 4, 6, 7, 12, 14, 21, 28, 42, 84. The highest common factor among them is 7.
The factors of 231 are: 1 3 7 11 21 33 77 231
A composite number is a number that has more than two factors. The factors of 21 are 1, 3, 7, and 21. Therefore, 21 is a composite number.
77 is a composite number; it has factors other than 1 and itself. It is not a prime number.The four factors of 77 are 1, 7, 11, and 77.The factor pairs of 77 are 1 x 77 and 7 x 11.The proper factors of 77 are 1, 7, and 11 or,if the definition you are using excludes 1, they are 7 and 11.The prime factors of 77 are 7 and 11.The 2 distinct prime factors of 77 are also 7 and 11, since there is no repetition of factors.The prime factorization of 77 is 7 x 11.
The factors of 693 are 1, 3, 7, 9, 11, 21, 33, 63, 77, 99, 231, and 693.