12011323011 has 4 divisors (see below), whose sum is σ = 16015097352. Its totient is φ = 8007548672.

The previous prime is 12011323007. The next prime is 12011323019. The reversal of 12011323011 is 11032311021.

It is a happy number.

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 12011323011 - 2² = 12011323007 is a prime.

It is a super-2 number, since 2×12011323011² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12011323019) 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, 2001887166 + ... + 2001887171.

It is an arithmetic number, because the mean of its divisors is an integer number (4003774338).

Almost surely, 2^12011323011 is an apocalyptic number.

12011323011 is a deficient number, since it is larger than the sum of its proper divisors (4003774341).

12011323011 is an equidigital number, since it uses as much as digits as its factorization.

12011323011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4003774340.

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 12011323011 its reverse (11032311021), we get a palindrome (23043634032).

The spelling of 12011323011 in words is "twelve billion, eleven million, three hundred twenty-three thousand, eleven".