This is a so-called palindrome, a term that designates a word or a sentence that can be read in both directions, like, for example, Otto or Anna. The presumably longest German word of this kind was discovered by the philosopher Arthur Schopenhauer: Reliefpfeiler.

The above quote is by André Thomkins, a great artist with an equally great interest in words, who therefore concerned himself very often with anagrams, palindromes and misspellings.