My goodness. Even if I could think up 26 facts, I have no idea how I would arrange them from A to Z. Seriously. :)
The Maya numeral system is a vigesimal (base-twenty) positional numeral system used by the Pre-Columbian Maya civilization.
Yes. Even so, that the Mayan numeral system was much more complex than the decimal system we use now: Maya numerals were a vigesimal (base twenty) numeral system.
Twenty-one in decimal notation is 21. In Roman numeral notation it is XXI.
XX
Under today's modern rules now governing the Roman numeral system 19 is now considered to be XIX but the ancient Romans would have probably notated it as XVIIII or as IXX because their Latin words are 'novemdecim' meaning nineteen and 'undeviginti' meaning one from twenty respectively but there is no Latin word for the equivalent of XIX Latin was the language spoken by the ancient Romans.
27,000
27000
520.029
thirteen and three hundred twenty one thousandth in base ten numeral
0.021
22 = XXII
It is written as 0.021.