I've read many of Satoshi's previous posts and writings, it's mind blowing how Satoshi was expecting bitcoin to come this far and he was prepared for it. Even in one of his posts he says he placed 8 decimals for upcoming decades... I've looked but couldn't find any info about what made him choose 21,000,000 as number of supply? Is there any logic/reason behind choosing that number? would love to know!
It seems to be just an arbitrary choice. He could have set any limit. I don't remember it being mentioned by anyone that he posted any reasons for it. It's just what he decided on, for reasons only he knows.
Personally I would have like it to be 42M.
