320023312021 has 4 divisors (see below), whose sum is σ = 365740928032. Its totient is φ = 274305696012.

The previous prime is 320023312003. The next prime is 320023312031. The reversal of 320023312021 is 120213320023.

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, and also an emirpimes, since its reverse is a distinct semiprime: 120213320023 = 31 ⋅3877849033.

It is a cyclic number.

It is not a de Polignac number, because 320023312021 - 2¹³ = 320023303829 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 320023312021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320023312031) 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, 22858807995 + ... + 22858808008.

It is an arithmetic number, because the mean of its divisors is an integer number (91435232008).

Almost surely, 2^320023312021 is an apocalyptic number.

It is an amenable number.

320023312021 is a deficient number, since it is larger than the sum of its proper divisors (45717616011).

320023312021 is an equidigital number, since it uses as much as digits as its factorization.

320023312021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45717616010.

The product of its (nonzero) digits is 432, while the sum is 19.

Adding to 320023312021 its reverse (120213320023), we get a palindrome (440236632044).

The spelling of 320023312021 in words is "three hundred twenty billion, twenty-three million, three hundred twelve thousand, twenty-one".