320420373163021 has 4 divisors (see below), whose sum is σ = 320420434050652. Its totient is φ = 320420312275392.

The previous prime is 320420373163013. The next prime is 320420373163027. The reversal of 320420373163021 is 120361373024023.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 177921958110121 + 142498415052900 = 13338739^2 + 11937270^2 .

It is a cyclic number.

It is not a de Polignac number, because 320420373163021 - 2³ = 320420373163013 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 (320420373163027) 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, 21716046 + ... + 33353071.

It is an arithmetic number, because the mean of its divisors is an integer number (80105108512663).

Almost surely, 2^{320420373163021} is an apocalyptic number.

It is an amenable number.

320420373163021 is a deficient number, since it is larger than the sum of its proper divisors (60887631).

320420373163021 is an equidigital number, since it uses as much as digits as its factorization.

320420373163021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60887630.

The product of its (nonzero) digits is 108864, while the sum is 37.

The spelling of 320420373163021 in words is "three hundred twenty trillion, four hundred twenty billion, three hundred seventy-three million, one hundred sixty-three thousand, twenty-one".