320013021 has 8 divisors (see below), whose sum is σ = 426862240. Its totient is φ = 213252912.

The previous prime is 320013019. The next prime is 320013061. The reversal of 320013021 is 120310023.

It is a happy number.

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

It is not a de Polignac number, because 320013021 - 2¹ = 320013019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 320012988 and 320013006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320013061) 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, 13390 + ... + 28623.

It is an arithmetic number, because the mean of its divisors is an integer number (53357780).

Almost surely, 2^320013021 is an apocalyptic number.

It is an amenable number.

320013021 is a deficient number, since it is larger than the sum of its proper divisors (106849219).

320013021 is a wasteful number, since it uses less digits than its factorization.

320013021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44555.

The product of its (nonzero) digits is 36, while the sum is 12.

The square root of 320013021 is about 17888.9077643103. The cubic root of 320013021 is about 683.9996558768. Note that the first 3 decimals are identical.

Adding to 320013021 its reverse (120310023), we get a palindrome (440323044).

The spelling of 320013021 in words is "three hundred twenty million, thirteen thousand, twenty-one".