321165135613 has 4 divisors (see below), whose sum is σ = 367045869280. Its totient is φ = 275284401948.

The previous prime is 321165135587. The next prime is 321165135647. The reversal of 321165135613 is 316531561123.

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 321165135613 - 2²⁵ = 321131581181 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321165135913) 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, 22940366823 + ... + 22940366836.

It is an arithmetic number, because the mean of its divisors is an integer number (91761467320).

Almost surely, 2^321165135613 is an apocalyptic number.

It is an amenable number.

321165135613 is a deficient number, since it is larger than the sum of its proper divisors (45880733667).

321165135613 is an equidigital number, since it uses as much as digits as its factorization.

321165135613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45880733666.

The product of its digits is 48600, while the sum is 37.

Adding to 321165135613 its reverse (316531561123), we get a palindrome (637696696736).

The spelling of 321165135613 in words is "three hundred twenty-one billion, one hundred sixty-five million, one hundred thirty-five thousand, six hundred thirteen".