It is a semiprime because it is the product of two primes.
It is a cyclic number.
It is a Duffinian number.
It is a congruent number.
Almost surely, 211101221112111 is an apocalyptic number.
11101221112111 is an equidigital number, since it uses as much as digits as its factorization.
11101221112111 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 853940085560.
Adding to 11101221112111 its reverse (11121112210111), we get a palindrome (22222333322222).
The spelling of 11101221112111 in words is "eleven trillion, one hundred one billion, two hundred twenty-one million, one hundred twelve thousand, one hundred eleven".