A trillion dollars equals 1,000 billion dollars. A billion dollars equals 1,000 million dollars. Expressed in numbers, a trillion dollars is $1,000,000,000,000. Any way you look at it, a trillion dollars is a phenomenal sum of money. For example, $1 trillion is roughly the same as the gross domestic product (GDP) of Mexico ($1.07 trillion in 2020) or Australia ($1.33 trillion in 2020).