2165006311321 has 4 divisors (see below), whose sum is σ = 2474292927232. Its totient is φ = 1855719695412.

The previous prime is 2165006311289. The next prime is 2165006311333. The reversal of 2165006311321 is 1231136005612.

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 2165006311321 - 2⁵ = 2165006311289 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2165006371321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 154643307945 + ... + 154643307958.

It is an arithmetic number, because the mean of its divisors is an integer number (618573231808).

Almost surely, 2^{2165006311321} is an apocalyptic number.

It is an amenable number.

2165006311321 is a deficient number, since it is larger than the sum of its proper divisors (309286615911).

2165006311321 is an equidigital number, since it uses as much as digits as its factorization.

2165006311321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309286615910.

The product of its (nonzero) digits is 6480, while the sum is 31.

The spelling of 2165006311321 in words is "two trillion, one hundred sixty-five billion, six million, three hundred eleven thousand, three hundred twenty-one".