13131312121 has 4 divisors (see below), whose sum is σ = 13141980544. Its totient is φ = 13120643700.

The previous prime is 13131312119. The next prime is 13131312149. The reversal of 13131312121 is 12121313131.

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 13131312121 - 2¹ = 13131312119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13131312221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5332365 + ... + 5334826.

It is an arithmetic number, because the mean of its divisors is an integer number (3285495136).

Almost surely, 2^13131312121 is an apocalyptic number.

It is an amenable number.

13131312121 is a deficient number, since it is larger than the sum of its proper divisors (10668423).

13131312121 is a wasteful number, since it uses less digits than its factorization.

13131312121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10668422.

The product of its digits is 108, while the sum is 19.

Adding to 13131312121 its reverse (12121313131), we get a palindrome (25252625252).

The spelling of 13131312121 in words is "thirteen billion, one hundred thirty-one million, three hundred twelve thousand, one hundred twenty-one".