12011111121011 has 4 divisors (see below), whose sum is σ = 12064023505032. Its totient is φ = 11958198736992.

The previous prime is 12011111121007. The next prime is 12011111121017. The reversal of 12011111121011 is 11012111111021.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12011111121011 - 2² = 12011111121007 is a prime.

It is a super-2 number, since 2×12011111121011² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12011111121017) 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, 26456191670 + ... + 26456192123.

It is an arithmetic number, because the mean of its divisors is an integer number (3016005876258).

Almost surely, 2^{12011111121011} is an apocalyptic number.

12011111121011 is a deficient number, since it is larger than the sum of its proper divisors (52912384021).

12011111121011 is an equidigital number, since it uses as much as digits as its factorization.

12011111121011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52912384020.

The product of its (nonzero) digits is 4, while the sum is 14.

Adding to 12011111121011 its reverse (11012111111021), we get a palindrome (23023222232032).

The spelling of 12011111121011 in words is "twelve trillion, eleven billion, one hundred eleven million, one hundred twenty-one thousand, eleven".