20320321321 has 4 divisors (see below), whose sum is σ = 20320779600. Its totient is φ = 20319863044.

The previous prime is 20320321309. The next prime is 20320321331. The reversal of 20320321321 is 12312302302.

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 20320321321 - 2¹⁵ = 20320288553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20320321331) 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, 154531 + ... + 254008.

It is an arithmetic number, because the mean of its divisors is an integer number (5080194900).

Almost surely, 2^20320321321 is an apocalyptic number.

It is an amenable number.

20320321321 is a deficient number, since it is larger than the sum of its proper divisors (458279).

20320321321 is an equidigital number, since it uses as much as digits as its factorization.

20320321321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 458278.

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

Adding to 20320321321 its reverse (12312302302), we get a palindrome (32632623623).

The spelling of 20320321321 in words is "twenty billion, three hundred twenty million, three hundred twenty-one thousand, three hundred twenty-one".