12100121

Appears in sequences

• Economical palindromes.at n=27A047739
• Numbers n such that the set S(n) = {k: k + reverse(k) = n} is not empty, at least one element of S(n) has the same number of digits as n and at least one element of S(n) has one digit less than n has.at n=17A088171
• Dates after Jan 01 1000 which are palindromic when they are written according to the ISO-8601-format YYYYMMDD.at n=25A210884