23571...11411 (76-digits)

This number is a prime.

                                                                      235711
1011311511 8119131335 3373383727 7577877979 1992910301 1050110601 1131111411

A prime formed from the concatenation of first n palindromic primes i.e., {2, 3, 5, 7, 11, 101, ... , 11311, 11411}, (case n = 25). [Gupta]