Just some fun facts about currencies (mainly to further prove the point):
The Zimbabwe dollar is currently the least valued currency (due to hyperinflation). 100 million Zimbabwe dollar (10^8) is (in practice, at least - officially, the exchange rate is merely 30,000 ZWD per USD) worth approximately 1 USD, thus, if the 30-digit figure was in this currency, the minimum would be 10^22 USD. By comparison, the richest person in the world is worth about 60 billion (6*10^10) USD.
Historically, the worst case of hyperinflation seen in modern times was in Hungary with the pengő. This was eventually replaced by the forint at a rate of a whopping 4*10^29 pengő per forint - so a 30-digit amount in pengő would end up at a maximum of 25 forint (this was worth about 2 USD at the time, and is only about 15 cents now).