12011031121 has 4 divisors (see below), whose sum is σ = 12023715312. Its totient is φ = 11998346932.

The previous prime is 12011031113. The next prime is 12011031161. The reversal of 12011031121 is 12113011021.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12011031121 - 2³ = 12011031113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12011031101) 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, 6340675 + ... + 6342568.

It is an arithmetic number, because the mean of its divisors is an integer number (3005928828).

Almost surely, 2^12011031121 is an apocalyptic number.

It is an amenable number.

12011031121 is a deficient number, since it is larger than the sum of its proper divisors (12684191).

12011031121 is an equidigital number, since it uses as much as digits as its factorization.

12011031121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12684190.

The product of its (nonzero) digits is 12, while the sum is 13.

Adding to 12011031121 its reverse (12113011021), we get a palindrome (24124042142).

The spelling of 12011031121 in words is "twelve billion, eleven million, thirty-one thousand, one hundred twenty-one".