A Catch-22 refers to an unsolvable logical dilemma.  The phrase comes from Joseph Heller’s 1961 novel “Catch-22.”  The number 22 has no significance.  Heller originally intended to call it “Catch-18,” but this was rejected by his publisher for being too similar to the title of another recently published war novel.  “Catch-11” was also proposed and rejected, due to its similarity to the film “Ocean’s Eleven” which was released in 1960.  “Catch-17” was then also rejected for similar reasons.  “Catch-14” was rejected because the publisher didn’t think 14 was a “funny number.”  If I were Joseph Heller, I would have just given up.  Clearly, there was no way he would win this battle with his publisher.