Double the Last Number

[Earthling]

_ 21,267,647,932,558,653,966,460,912,964,485,513,216


+ 21,267,647,932,558,653,966,460,912,964,485,513,216


-----------------------------------------------------


= 42 535 295 865 117 307 932 921 825 928 971 026 432


That is, forty-two undecillion, five hundred and thirty-five decillion, two hundred and ninety-five nonillion, eight hundred and sixty-five octillion, one hundred and seventeen septillion, three hundred and seven sextillion, nine hundred and thirty-two quintillion, nine hundred and twenty-one quadrillion, eight hundred and twenty-five trillion, nine hundred and twenty-eight billion, nine hundred and seventy-one million, twenty-six thousand, four hundred and thirty-two.

Or 2¹²⁵.

For reference, that's about 42.5 times the size of the galaxy in femtometers.