It is a sphenic number, since it is the product of 3 distinct primes.
It is a de Polignac number, because none of the positive numbers 2k-21111121112001 is a prime.
Almost surely, 221111121112001 is an apocalyptic number.
It is an amenable number.
21111121112001 is a wasteful number, since it uses less digits than its factorization.
21111121112001 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 549824535.
Adding to 21111121112001 its reverse (10021112111112), we get a palindrome (31132233223113).
The spelling of 21111121112001 in words is "twenty-one trillion, one hundred eleven billion, one hundred twenty-one million, one hundred twelve thousand, one".