Twelvety-twelves

Twelvety-twelves is even more interesting than eleventy-eleven, as it is paradoxically a double-digit repdigit with two different digits repeated alternatingly. It also uses an "improper" name, rather than "hundred-twenty-twenties" or "ten-dozen-twenties". I Its decimal representation is:

12121212121212121212121212121212121212121212121212121212121212121212121212121212121212121212121212121212121212121212121212121212121212121212121212121212121212121212121212121212121212121212121212121212121212121212121212121212121212121212121212121212121212121212121212121212121212121212121212121212121212121212121212121212121212121212121212121212121212121212121212121212121212121212121212121212121212121212121212121212121212121212121212121212

or metamathematically with interior superscription as \(12^{58}12\)

googology