2239

This number is a prime.

The larger in the first pair of right/left-truncatable primes. [Loungrides]

The smallest prime formed by inserting a prime p between the digits of its next prime q, i.e., (p, q) = (23, 29). Note that by inserting the prime q between the digits of prime p we have also a prime, i.e., 2293. [Loungrides]