320444042255021 has 32 divisors (see below), whose sum is σ = 358364668464000. Its totient is φ = 284751781558272.

The previous prime is 320444042255017. The next prime is 320444042255023. The reversal of 320444042255021 is 120552240444023.

It is not a de Polignac number, because 320444042255021 - 2² = 320444042255017 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 (320444042255023) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 121060190 + ... + 123678848.

It is an arithmetic number, because the mean of its divisors is an integer number (11198895889500).

Almost surely, 2^{320444042255021} is an apocalyptic number.

It is an amenable number.

320444042255021 is a deficient number, since it is larger than the sum of its proper divisors (37920626208979).

320444042255021 is a wasteful number, since it uses less digits than its factorization.

320444042255021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2619981.

The product of its (nonzero) digits is 307200, while the sum is 38.

Adding to 320444042255021 its reverse (120552240444023), we get a palindrome (440996282699044).

The spelling of 320444042255021 in words is "three hundred twenty trillion, four hundred forty-four billion, forty-two million, two hundred fifty-five thousand, twenty-one".