Furthermore, the block reward was not 50.00,000,000 bitcoin.satoshis BUT 10,000.0000 bitcoin.satoshis. This didn't mean a supply of 21 million bitcoin or 2.1 quadrillion satoshis... BUT 1.99 billion bitcoin or 19.9 trillion satoshis TOTAL!

This 2008 source code was a rough draft. These were temporary numbers and parameters, inputted as place holders for future refinement. They were not serious final draft considerations. This source code was a work in progress during Bitcoin's inception

We could of had 2 billion bitcoin and not enough satoshis to go around. Ghastly. So thank god Satoshi settled on 21 million bitcoin, with 8 decimal places on both sides of the dot.