320104021 has 8 divisors (see below), whose sum is σ = 322170264. Its totient is φ = 318044160.

The previous prime is 320103991. The next prime is 320104049. The reversal of 320104021 is 120401023.

It can be written as a sum of positive squares in 4 ways, for example, as 13468900 + 306635121 = 3670^2 + 17511^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 320104021 - 2¹⁵ = 320071253 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 320103992 and 320104010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320104061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 133251 + ... + 135631.

It is an arithmetic number, because the mean of its divisors is an integer number (40271283).

Almost surely, 2^320104021 is an apocalyptic number.

It is an amenable number.

320104021 is a deficient number, since it is larger than the sum of its proper divisors (2066243).

320104021 is a wasteful number, since it uses less digits than its factorization.

320104021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3191.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 320104021 is about 17891.4510590952. The cubic root of 320104021 is about 684.0644845615.

Adding to 320104021 its reverse (120401023), we get a palindrome (440505044).

The spelling of 320104021 in words is "three hundred twenty million, one hundred four thousand, twenty-one".