12721

+ The smallest palindromic prime p such that (p+1)/2 and (p+2)/3 are also prime. [Russo]

+ The smallest prime p where p+1=2*prime, p+2=3*prime, and p+3=4*prime. [Marot]

+ A palindromic prime that is one more than the sum of the numbers 1 to 159. [Green]

+ Smallest palindromic prime such that product of its digits is a perfect number. [Gupta]

(There are 3 curios for this number that have not yet been approved by an editor.)

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