13121333311321 has 4 divisors (see below), whose sum is σ = 13121451289872. Its totient is φ = 13121215332772.

The previous prime is 13121333311189. The next prime is 13121333311351. The reversal of 13121333311321 is 12311333312131.

It is a happy number.

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 13121333311321 - 2²¹ = 13121331214169 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13121333311321.

It is not an unprimeable number, because it can be changed into a prime (13121333311351) 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, 58822291 + ... + 59044936.

It is an arithmetic number, because the mean of its divisors is an integer number (3280362822468).

Almost surely, 2^{13121333311321} is an apocalyptic number.

It is an amenable number.

13121333311321 is a deficient number, since it is larger than the sum of its proper divisors (117978551).

13121333311321 is a wasteful number, since it uses less digits than its factorization.

13121333311321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117978550.

The product of its digits is 2916, while the sum is 28.

Adding to 13121333311321 its reverse (12311333312131), we get a palindrome (25432666623452).

The spelling of 13121333311321 in words is "thirteen trillion, one hundred twenty-one billion, three hundred thirty-three million, three hundred eleven thousand, three hundred twenty-one".