46445...32211 (129-digits)

This number is a prime.

            464454444 4344244144 0439338337 3363353343 3333233133 0329228227
2262252242 2322222122 0219118117 1161151141 1311211111 0199887766 5544332211

The smallest prime greater than a googol formed by concatenating in descending order the first n multidigit palindromic numbers (case n=46). [Gupta]