13331311121 has 4 divisors (see below), whose sum is σ = 13339577652. Its totient is φ = 13323044592.

The previous prime is 13331311111. The next prime is 13331311139. The reversal of 13331311121 is 12111313331.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11726507521 + 1604803600 = 108289^2 + 40060^2 .

It is a cyclic number.

It is not a de Polignac number, because 13331311121 - 2⁶ = 13331311057 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13331311093 and 13331311102.

It is not an unprimeable number, because it can be changed into a prime (13331311111) 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, 4130846 + ... + 4134071.

It is an arithmetic number, because the mean of its divisors is an integer number (3334894413).

Almost surely, 2^13331311121 is an apocalyptic number.

It is an amenable number.

13331311121 is a deficient number, since it is larger than the sum of its proper divisors (8266531).

13331311121 is an equidigital number, since it uses as much as digits as its factorization.

13331311121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8266530.

The product of its digits is 162, while the sum is 20.

Adding to 13331311121 its reverse (12111313331), we get a palindrome (25442624452).

The spelling of 13331311121 in words is "thirteen billion, three hundred thirty-one million, three hundred eleven thousand, one hundred twenty-one".