12121140409 has 4 divisors (see below), whose sum is σ = 13852731904. Its totient is φ = 10389548916.

The previous prime is 12121140401. The next prime is 12121140413. The reversal of 12121140409 is 90404112121.

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, and also an emirpimes, since its reverse is a distinct semiprime: 90404112121 = 953 ⋅94862657.

It is a cyclic number.

It is not a de Polignac number, because 12121140409 - 2³ = 12121140401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12121140401) 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, 865795737 + ... + 865795750.

It is an arithmetic number, because the mean of its divisors is an integer number (3463182976).

Almost surely, 2^12121140409 is an apocalyptic number.

It is an amenable number.

12121140409 is a deficient number, since it is larger than the sum of its proper divisors (1731591495).

12121140409 is an equidigital number, since it uses as much as digits as its factorization.

12121140409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1731591494.

The product of its (nonzero) digits is 576, while the sum is 25.

The spelling of 12121140409 in words is "twelve billion, one hundred twenty-one million, one hundred forty thousand, four hundred nine".