10 to the 20th Power, But Not Worth a Dime

10^{20 is a really big number.  It is , I am told, equivalent to 100 quintillion.  In 1946, Hungary circulated a banknote in this amount, which has the dubious distinction of being the highest currency denomination ever issued for general use.  Next to that, Zimbabwe's 100 billion note is small change, though that is cold comfort for those enduring stratospheric hyperinflation.}