320764206464021 has 4 divisors (see below), whose sum is σ = 320764892930592. Its totient is φ = 320763519997452.

The previous prime is 320764206463991. The next prime is 320764206464027. The reversal of 320764206464021 is 120464602467023.

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 320764206464021 - 2²² = 320764202269717 is a prime.

It is a super-2 number, since 2×320764206464021² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320764206464027) 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, 342531905 + ... + 343467078.

It is an arithmetic number, because the mean of its divisors is an integer number (80191223232648).

Almost surely, 2^{320764206464021} is an apocalyptic number.

It is an amenable number.

320764206464021 is a deficient number, since it is larger than the sum of its proper divisors (686466571).

320764206464021 is an equidigital number, since it uses as much as digits as its factorization.

320764206464021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 686466570.

The product of its (nonzero) digits is 2322432, while the sum is 47.

The spelling of 320764206464021 in words is "three hundred twenty trillion, seven hundred sixty-four billion, two hundred six million, four hundred sixty-four thousand, twenty-one".