13340312121 has 4 divisors (see below), whose sum is σ = 17787082832. Its totient is φ = 8893541412.

The previous prime is 13340312113. The next prime is 13340312123. The reversal of 13340312121 is 12121304331.

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: 12121304331 = 3 ⋅4040434777.

It is not a de Polignac number, because 13340312121 - 2³ = 13340312113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13340312123) 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, 2223385351 + ... + 2223385356.

It is an arithmetic number, because the mean of its divisors is an integer number (4446770708).

Almost surely, 2^13340312121 is an apocalyptic number.

It is an amenable number.

13340312121 is a deficient number, since it is larger than the sum of its proper divisors (4446770711).

13340312121 is an equidigital number, since it uses as much as digits as its factorization.

13340312121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4446770710.

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 13340312121 its reverse (12121304331), we get a palindrome (25461616452).

The spelling of 13340312121 in words is "thirteen billion, three hundred forty million, three hundred twelve thousand, one hundred twenty-one".