320423221 has 4 divisors (see below), whose sum is σ = 320640192. Its totient is φ = 320206252.

The previous prime is 320423209. The next prime is 320423251. The reversal of 320423221 is 122324023.

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 320423221 - 2⁷ = 320423093 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 (320423251) 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 3 ways as a sum of consecutive naturals, for example, 106255 + ... + 109228.

It is an arithmetic number, because the mean of its divisors is an integer number (80160048).

Almost surely, 2^320423221 is an apocalyptic number.

It is an amenable number.

320423221 is a deficient number, since it is larger than the sum of its proper divisors (216971).

320423221 is a wasteful number, since it uses less digits than its factorization.

320423221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216970.

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 320423221 is about 17900.3692978665. The cubic root of 320423221 is about 684.2917865534.

Adding to 320423221 its reverse (122324023), we get a palindrome (442747244).

The spelling of 320423221 in words is "three hundred twenty million, four hundred twenty-three thousand, two hundred twenty-one".