It’s in Latin, the official Language of the Vatican. A.N. is anno numeris, essentially 21 years. Yes, yearofglad, P.M. is Pontifex Maximus, one of the Pope’s titles. It’s actually a Vatican coin, not Italian. But the Vatican uses Italian currency.
And it’s “anno numeris 21” because it is minted “in the 21st year of his mandate”. This used to be how years were counted in Rome (and many other areas) before the invention of “the Christian era”; that those years weren’t necessarily full natural years (somebody’s 10th year could also be the 1st year of his successor, and a natural year might even see three rulers) is one of the reasons the placement of year 1 DC was off by a handful of years.
Just the fact that you were able to type it out on your keyboard is proof that it wasn’t Greek.
I was in Ireland in 2003 (after the introduction of the Euro). We found one or two Vatican coins among our loose change. The overall design of the coins and bills, and the reverse (tails) side showing a map of Europe, were the same for all countries, but every country gets to decide on its own what they want on the obverse (heads). Countries that still have monarchs (including Vatican City) mostly go with a portrait of their monarch, while Ireland, very proud not to have a monarch, used a harp, the national symbol. IIRC, Germany and France use various prominent historical figures.
Interesting. Vatican City seems to be one of four countries allowed to mint their own euro coins, even though they are not part of the European Union. The others are Monaco, San Marino, and Andorra. (Before the adoption of the euro, Andorra did not have an official currency, but just used the Spanish peseta and French franc.)
There are about a dozen different European international coalitions, each with slightly different membership. The countries you mention are part of the Eurozone but not the EU, while the UK before Brexit was the reverse. Then there’s the Schengen area, the coalitions responsible for the ESA and CERN, and several others that I don’t know the details of.
This is something of a nitpick, but the four countries I mentioned are not part of the Eurozone, but use the euro through monetary agreements with the EU. Montenegro and Kosovo use the euro unilaterally, without an agreement.