There are indeed rare dimes that can be worth a significant amount of money, but $22 million for a single dime is exceedingly high. Certain rare dimes, such as the 1894-S Barber Dime or the 1796 Draped Bust Dime, can fetch high prices in the thousands or even hundreds of thousands of dollars, but nowhere near millions.
The Bicentennial Quarter refers to the quarter dollar coin minted in 1976 to commemorate the 200th anniversary of the United States Declaration of Independence. While there are some variations and errors associated with these quarters that can make them valuable to collectors, they typically do not reach anywhere near $22 million in value.
The idea that these rare coins are still in circulation is highly improbable. Rare coins of such high value would most likely have been discovered and removed from circulation long ago by collectors, numismatists, or individuals aware of their potential worth.
Coins of such extreme value would undergo rigorous authentication and grading processes by reputable numismatic organizations such as the Professional Coin Grading Service (PCGS) or the Numismatic Guaranty Corporation (NGC).
The numismatic market is highly interconnected and closely monitored by collectors, dealers, and researchers. If coins of such extraordinary value were circulating, it would likely become widely known within the numismatic community and lead to intense efforts to locate and acquire them.