13121310311321 has 4 divisors (see below), whose sum is σ = 13132932376500. Its totient is φ = 13109688246144.

The previous prime is 13121310311311. The next prime is 13121310311353. The reversal of 13121310311321 is 12311301312131.

13121310311321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 8003603116096 + 5117707195225 = 2829064^2 + 2262235^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13121310311321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13121310311311) 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, 5811030896 + ... + 5811033153.

It is an arithmetic number, because the mean of its divisors is an integer number (3283233094125).

Almost surely, 2^{13121310311321} is an apocalyptic number.

It is an amenable number.

13121310311321 is a deficient number, since it is larger than the sum of its proper divisors (11622065179).

13121310311321 is a wasteful number, since it uses less digits than its factorization.

13121310311321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11622065178.

The product of its (nonzero) digits is 324, while the sum is 23.

Adding to 13121310311321 its reverse (12311301312131), we get a palindrome (25432611623452).

The spelling of 13121310311321 in words is "thirteen trillion, one hundred twenty-one billion, three hundred ten million, three hundred eleven thousand, three hundred twenty-one".