In addition to 1991 and 2002, you can find more palindromes among the years of the 20th and 21st century by converting the years to other bases. For example, 2015 converted to binary (base 2) is 11111011111, a palindrome.
Other 20th- and 21st-century years that are palindromes when converted to binary are 1911 (11101110111), 1935 (11110001111), 1967 (11110101111), 2047 (11111111111) and 2049 (100000000001).
In base 3 (trinary), we have 1913 (2121212), 1940 (2122212), 1952 (2200022), 1979 (2201022), 2006 (2202022), 2042 (2210122), 2069 (2211122) and 2096 (2212122).
In base 4, there are 1965 (132231), 2045 (133331) and 2050 (200002).
In base 5, we get 1903 (30103), 1928 (30203), 1953 (30303), 1978 (30403), 2008 (31013), 2033 (31113), 2058 (31213) and 2083 (31313).
In base 6, there are 1921 (12521), 1963 (13031), 1999 (13131), 2035 (13231) and 2071 (13331).
In base 7: 1944 (5445), 2000 (5555), 2056 (5665) and 2064 (6006).
In base 8 (octal): 1971 (3663), 2043 (3773) and 2052 (4004).
In base 9: 1910 (2552), 2000 (2662) and 2090 (2772).
And finally I present hexadecimal (base 16): 1911 (777), 1927 (787), 1943 (797), 1959 (7A7), 1975 (7B7), 1991 (7C7), 2007 (7D7), 2023 (7E7), 2039 (7F7), 2056 (808), 2072 (818) and 2088 (828).
1991, 2002
1961 is a special case, since it reads the same upside down.
2002 is the only one I think
the 10th of January 2001 ( 10.1.01 )
2002
We are in the 21st Century.
the 21st century
~this is the 21st century
2002
2002 was a palindromic year if we have the format day/mo/yr 10/02/2001
Yes they do have batteries in the 21st century and had in the 20th century.
Presumably you mean what date will have the most Roman numerals in the 21st century? If so then it will be December 31 2088 which will be: XII-XXXI-MMLXXXVIII actually, August 28, 2088 will be the most Roman Numerals in the 21st Century: VIII-XXVIII-MMLXXXVIII
1771
No, there is no apostrophe in the phrase "21st century."
The century is alway one bigger than the date, so 1792 is late 18th century and 2008 is early 21st century.
Pizza