99222...22299 (99-digits)

This number is a prime.

                                             992222222 2222222222 2222222222
2222222222 2222222222 2222222222 2222222222 2222222222 2222222222 2222222299

The largest palindromic prime p, less than a googol, of the form p=99ddd...ddd99 where d is any digit. [Loungrides]