Just think they have $100 T note... and they wiped out 10 zeros from the last series before printing that one.
If they hadn't wiped out those zeros... that 100T note would be 1,000,000,000,000,000,000,000,000 in the old series. That is 1 x 10^28 there is only 6.022 x 10^23 atom in a mole of an element.
-SWUSC