218

218 = 2 x 109.

218 has a representation as a sum of two squares: 218 = 7² + 13².

218 is the number of simple directed graphs of four nodes.

218 is 1333 in base 5, 1002 in base 6, 262 in base 9, and 118 in base 14.

218 is the number of votes required in the United States House of Representatives to achieve a majority.

Source: Number Gossip