35
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35 is the answer. 210 divided by 6 is 35.
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Since the digits of 210 add up to 3, and that is divisible by 3 then 210 is divisible by 3. This works for 3, 9, and 27.
None, if a number is divisible by 210 then it is not a prime number!
21 and 35 are both divisible by 7 21/35 = 3/5