It is a strong prime.
It is a cyclic number.
It is a Chen prime.
Almost surely, 221211010220011 is an apocalyptic number.
21211010220011 is an equidigital number, since it uses as much as digits as its factorization.
21211010220011 is an odious number, because the sum of its binary digits is odd.
Adding to 21211010220011 its reverse (11002201011212), we get a palindrome (32213211231223).
The spelling of 21211010220011 in words is "twenty-one trillion, two hundred eleven billion, ten million, two hundred twenty thousand, eleven".