"Why 21 million? The truth is, it was an educated guess. The math worked out, or as close to it as I had wanted it to. Before settling  on 21 million however, I had considered making 100 BTC as the reward, and 42—the answer to life, the universe, and everything. But afraid that others would consider my reference to Hitchhikers Guide to the Galaxy a quip and at the expense of not being taken seriously, I changed it to 21 million," the author writes.

In This text he say why 21 Million
But watashi-kokoto have shit solution and only and Magic to disappear  Last Active: January 19, 2019, 03:50:45 PM

He say:
my approach
start with shit solution

SheIsCombingWithTheCombFeelsGood

then you can replace "The" with "A"
fill the extra space with new words

SheIsCombingWithACombThatMagical

then you can reorder

ACombThatMagicalSheIsCombingWith

or even

AMagicalCombThatSheIsCombingWith

put back "The", change "Magical" to "Magic"

TheMagicCombThatSheIsCombingWith