91979...97919 (95-digits)

This number is a prime.

                                                 91979 7787757727 3833733533
1319118115 1131101117 5323571110 1131151181 1913133533 7338372775 7787797919

The largest known palindromic prime constructed from the concatenation of the first n palindromic primes (in this case, n = 19). The next palindromic prime in this form (if it exists) will have more than 2*10^5 digits. [Antonious]