12131549121 has 4 divisors (see below), whose sum is σ = 16175398832. Its totient is φ = 8087699412.

The previous prime is 12131549093. The next prime is 12131549141. The reversal of 12131549121 is 12194513121.

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 not a de Polignac number, because 12131549121 - 2⁹ = 12131548609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12131549141) 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, 2021924851 + ... + 2021924856.

It is an arithmetic number, because the mean of its divisors is an integer number (4043849708).

Almost surely, 2^12131549121 is an apocalyptic number.

It is an amenable number.

12131549121 is a deficient number, since it is larger than the sum of its proper divisors (4043849711).

12131549121 is an equidigital number, since it uses as much as digits as its factorization.

12131549121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4043849710.

The product of its digits is 2160, while the sum is 30.

The spelling of 12131549121 in words is "twelve billion, one hundred thirty-one million, five hundred forty-nine thousand, one hundred twenty-one".