101

This number is a prime.

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The only 3-digit number whose digits are neither prime nor composite. [Gudipati]

The only Cyclops palindromic wing prime. In other words, the only palindromic wing prime with central digit 0. [Gudipati]

The two largest known pi-primes (primes formed by first n digits of pi) have 613373 digits and 78073 digits. Interestingly, both 613373 and 78073 are semiprimes whose smallest prime factor is 101. [Gudipati]

An odd perfect number, if exists, must have at least 101 prime factors if we include multiplicity. [Gudipati]