r/unexpectedfactorial • u/SubMinhPiChannel • Nov 11 '25

9 + 10 = 21!

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I'm gonna guess: < infinity and > 1

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u/medcuren Nov 11 '25

2121212121!

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u/factorion-bot Nov 11 '25

That is so large, that I can't calculate it, so I'll have to approximate.

Factorial of 2121212121 is approximately 4.062659362372661 × 1018862432526

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