The prime factorization of 399 is 3 x 7 x 19.
21 wouldn't be included since it isn't a Prime number.
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399 = 3 * 7 * 19
Amazon and other retailers want $399 for their preorders of the PS4
The greatest common factor of 570 , 399 = 57
399 BC
The least common multiple of 21 , 19 = 399