13331121321 has 16 divisors (see below), whose sum is σ = 20375472128. Its totient is φ = 7594765200.

The previous prime is 13331121317. The next prime is 13331121347. The reversal of 13331121321 is 12312113331.

It is a happy number.

It is not a de Polignac number, because 13331121321 - 2² = 13331121317 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13331125321) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 951985 + ... + 965886.

It is an arithmetic number, because the mean of its divisors is an integer number (1273467008).

Almost surely, 2^13331121321 is an apocalyptic number.

It is an amenable number.

13331121321 is a deficient number, since it is larger than the sum of its proper divisors (7044350807).

13331121321 is a wasteful number, since it uses less digits than its factorization.

13331121321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1918212.

The product of its digits is 324, while the sum is 21.

Adding to 13331121321 its reverse (12312113331), we get a palindrome (25643234652).

The spelling of 13331121321 in words is "thirteen billion, three hundred thirty-one million, one hundred twenty-one thousand, three hundred twenty-one".