320323213021 has 24 divisors (see below), whose sum is σ = 384988553664. Its totient is φ = 265573728000.

The previous prime is 320323213009. The next prime is 320323213027. The reversal of 320323213021 is 120312323023.

It is not a de Polignac number, because 320323213021 - 2¹³ = 320323204829 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 320323212983 and 320323213001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320323213027) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 520980 + ... + 955021.

It is an arithmetic number, because the mean of its divisors is an integer number (16041189736).

Almost surely, 2^320323213021 is an apocalyptic number.

It is an amenable number.

320323213021 is a deficient number, since it is larger than the sum of its proper divisors (64665340643).

320323213021 is a wasteful number, since it uses less digits than its factorization.

320323213021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1476161 (or 1476154 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 22.

Adding to 320323213021 its reverse (120312323023), we get a palindrome (440635536044).

The spelling of 320323213021 in words is "three hundred twenty billion, three hundred twenty-three million, two hundred thirteen thousand, twenty-one".