12922

Way back at 12021 I think I noticed that the numbers were palindromic, but said, incorrectly, it'd take until 13031 for that to happen again. I forgot that with 5 digit numbers, it's once every hundred. So 12021, 12121, 12221, 12321, 12421, 12521, 12621, 12721, 12821 and 12921 were all palindromes, and 13031 will be too.