The number 42 is, in The Hitchhiker's Guide to the Galaxy by Douglas Adams, the "Answer to the Ultimate Question of Life, the Universe, and Everything", calculated by an enormous supercomputer named Deep Thought over a period of 7.5 million years.
Divisors: 1, 2, 3, 6, 7, 14, 21, 42
Greek numeral: ΜΒ´