121011111011111 has 24 divisors (see below), whose sum is σ = 129170132585760. Its totient is φ = 113330825346816.

The previous prime is 121011111011099. The next prime is 121011111011113. The reversal of 121011111011111 is 111110111110121.

It is not a de Polignac number, because 121011111011111 - 2⁶ = 121011111011047 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121011111011113) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6146051 + ... + 16727108.

It is an arithmetic number, because the mean of its divisors is an integer number (5382088857740).

Almost surely, 2^{121011111011111} is an apocalyptic number.

121011111011111 is a deficient number, since it is larger than the sum of its proper divisors (8159021574649).

121011111011111 is a wasteful number, since it uses less digits than its factorization.

121011111011111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22873415 (or 22873392 counting only the distinct ones).

The product of its (nonzero) digits is 2, while the sum is 14.

Adding to 121011111011111 its reverse (111110111110121), we get a palindrome (232121222121232).

The spelling of 121011111011111 in words is "one hundred twenty-one trillion, eleven billion, one hundred eleven million, eleven thousand, one hundred eleven".