4421

+ 4421 = 1! - 2! + 3! - 4! + 5! - 6! + 7! is prime. [Poo Sung]

+ The elevation of the summit of Mount Whitney, the highest summit in the contiguous United States, is 4421 meters using a new vertical datum established in 1988 (NAVD88). [Green]

(There are 6 curios for this number that have not yet been approved by an editor.)

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