I don't have the stats - but a significant % of that 81 million came out to vote AGAINST Trump.
Big Lie believers keep repeating that there is "no way" 81 million voted for Biden. They shouldn't lose any sleep over it. They're correct. Trump was such a repugnant President and candidate that many Americans came out simply to vote him out of office. He played only to the base, and made no effort whatsoever to appeal to independents.
81,283,501 popular vote Biden
https://en.wikipedia.org/wiki/2020_United_States_presidential_election
Now if you are suggesting that Xerox machines nationwide were so energized as to manufacture ballots to pump up Biden's vote you are correct