14

This number is a composite.

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The concatenation of 14, the 1st and the 4th primes, is a prime whose sum of digits is 14. Note that the product of the 1st and the 4th primes is 14. [Silva]

The smallest number whose prime divisors sum to a square. [Silva]

The smallest semiprime whose distinct prime divisors sum to another semiprime. [Silva]

The smallest number whose sum and difference of the digits are twin primes. [Silva]

The first multidigit prime difference between consecutive primes. See gaps between primes. [Silva]

14 is the smallest semiprime average of a semiprime number of first semiprimes, i.e., (4 + 6 + 9 + 10 + 14 + 15 + 21 + 22 + 25)/9 = 14. [Silva]