palindromic number

A **palindromic number** is a numeric value that remains the same when its digits are reversed. These numbers read identically forwards and backwards, such as 121, 1331, or 12321. Palindromic numbers occur in various number systems and have interesting properties and applications in mathematics, coding, and recreational puzzles. This tag can be used for posts discussing their characteristics, patterns, algorithms to detect them, or their role in number theory.