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Every number greater than 121 is the sum of distinct primes of the form 4n + 1. [Wells] The smallest palindromic composite such that some permutation of digits is prime. 121 is the only odd palindromic square with an odd number of digits that is divisible by a palindromic prime number with an even number of digits. [Luhn] Smallest palindrome pseudoprime to base 3. [De Geest] A palindrome whose prime factors are palindromic. [Russo] 121 can be expressed as the sum of a prime and its reversal for exactly three distinct primes. [Patterson] The smallest threedigit number such that the sum of the values that result by placing the exponentation symbol (^) between any two consecutive digits is prime (i.e., 1^21+12^1 is prime.) [Opao]
(There is one curio for this number that has not yet been approved by an editor.)
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