Only one and itself because 67 is a Prime number
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1, 2, 67, 134.
Nothing can go evenly into 21 or 17. They are both odd numbers and therefore cannot be evenly divided.
67 is a prime number, but 21 isn't. A prime number can only be evenly divided by '1' and itself. 21 can be evenly divided by 1, 3, 7, and 21.
1,3,5,9,15,45
255