320204313440021 has 48 divisors (see below), whose sum is σ = 353565707249664. Its totient is φ = 288964915776000.

The previous prime is 320204313439943. The next prime is 320204313440029. The reversal of 320204313440021 is 120044313402023.

It is not a de Polignac number, because 320204313440021 - 2³⁸ = 319929435533077 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320204313440029) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 801146396 + ... + 801545978.

It is an arithmetic number, because the mean of its divisors is an integer number (7365952234368).

Almost surely, 2^{320204313440021} is an apocalyptic number.

320204313440021 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

320204313440021 is a deficient number, since it is larger than the sum of its proper divisors (33361393809643).

320204313440021 is a wasteful number, since it uses less digits than its factorization.

320204313440021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 400114 (or 400083 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 29.

Adding to 320204313440021 its reverse (120044313402023), we get a palindrome (440248626842044).

The spelling of 320204313440021 in words is "three hundred twenty trillion, two hundred four billion, three hundred thirteen million, four hundred forty thousand, twenty-one".