20331311321 has 4 divisors (see below), whose sum is σ = 20379604644. Its totient is φ = 20283018000.

The previous prime is 20331311267. The next prime is 20331311339. The reversal of 20331311321 is 12311313302.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4908403600 + 15422907721 = 70060^2 + 124189^2 .

It is a cyclic number.

It is not a de Polignac number, because 20331311321 - 2⁶ = 20331311257 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20331311293 and 20331311302.

It is not an unprimeable number, because it can be changed into a prime (20331311921) 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, 24146030 + ... + 24146871.

It is an arithmetic number, because the mean of its divisors is an integer number (5094901161).

Almost surely, 2^20331311321 is an apocalyptic number.

It is an amenable number.

20331311321 is a deficient number, since it is larger than the sum of its proper divisors (48293323).

20331311321 is an equidigital number, since it uses as much as digits as its factorization.

20331311321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48293322.

The product of its (nonzero) digits is 324, while the sum is 20.

Adding to 20331311321 its reverse (12311313302), we get a palindrome (32642624623).

The spelling of 20331311321 in words is "twenty billion, three hundred thirty-one million, three hundred eleven thousand, three hundred twenty-one".