First of all, Days, the mints do not print paper money, that is under the control of BEP, Bureau of Engraving and Printing. Secondly, where do you get this 'quadrillion' from? The total amount of cash/coin, plus demand deposits, travelers checks, and other checkable deposits, comes to just over $2 trillion. This idea that the treasury keeps printing paper, and throwing it into the economy is untrue. Yes, BEP has currency printed, to replace worn out notes.
As for worthless money, the U.S. is the largest owner of gold, with over 8,133 tonnes of gold in reserve. I wouldn't believe everything you read.