How do you spell gizillion?

"Gizillion" is not a real word. It's a made-up word used to represent a very large number, like "zillion."

If you want to express a large quantity, you could use:

* Trillion: 1,000,000,000,000

* Quadrillion: 1,000,000,000,000,000

* Quintillion: 1,000,000,000,000,000,000

* And so on...

Or, you could just say "a lot" or "tons." 😉