265223321321 has 4 divisors (see below), whose sum is σ = 303112367232. Its totient is φ = 227334275412.

The previous prime is 265223321317. The next prime is 265223321333. The reversal of 265223321321 is 123123322562.

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 265223321321 - 2² = 265223321317 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (265223321371) 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, 18944522945 + ... + 18944522958.

It is an arithmetic number, because the mean of its divisors is an integer number (75778091808).

Almost surely, 2^265223321321 is an apocalyptic number.

It is an amenable number.

265223321321 is a deficient number, since it is larger than the sum of its proper divisors (37889045911).

265223321321 is an equidigital number, since it uses as much as digits as its factorization.

265223321321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37889045910.

The product of its digits is 25920, while the sum is 32.

Adding to 265223321321 its reverse (123123322562), we get a palindrome (388346643883).

The spelling of 265223321321 in words is "two hundred sixty-five billion, two hundred twenty-three million, three hundred twenty-one thousand, three hundred twenty-one".