How Much is A Trillion?: One trillion dollars is a one with twelve zeroes after it — that’s $1,000,000,000,000. It’s such a big number, it’s hard to understand. If someone spent one million dollars every single day, it would take nearly 3,000 years to spend it all. A stack of one-dollar bills worth a trillion dollars would stretch almost all the way to the moon. That’s how massive one trillion dollars really is.