121011110111 has 4 divisors (see below), whose sum is σ = 121034029824. Its totient is φ = 120988190400.

The previous prime is 121011110063. The next prime is 121011110123. The reversal of 121011110111 is 111011110121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 111011110121 = 977 ⋅113624473.

It is a cyclic number.

It is not a de Polignac number, because 121011110111 - 2¹⁸ = 121010847967 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121011110092 and 121011110101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121011110161) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11451935 + ... + 11462496.

It is an arithmetic number, because the mean of its divisors is an integer number (30258507456).

Almost surely, 2^121011110111 is an apocalyptic number.

121011110111 is a deficient number, since it is larger than the sum of its proper divisors (22919713).

121011110111 is an equidigital number, since it uses as much as digits as its factorization.

121011110111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22919712.

The product of its (nonzero) digits is 2, while the sum is 11.

Adding to 121011110111 its reverse (111011110121), we get a palindrome (232022220232).

The spelling of 121011110111 in words is "one hundred twenty-one billion, eleven million, one hundred ten thousand, one hundred eleven".