13121...11213 (33-digits)

This number is a prime.

                                        131 2111098765 4321234567 8910111213

It is the smallest prime in the Smarandache Mirror Sequence 1, 212, 32123, ..., 98765432123456789, 109876543212345678910, 1110987654321234567891011, ... . It is the only known prime in the sequence. [Gupta]