20311323321 has 4 divisors (see below), whose sum is σ = 27081764432. Its totient is φ = 13540882212.

The previous prime is 20311323301. The next prime is 20311323343. The reversal of 20311323321 is 12332311302.

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 de Polignac number, because none of the positive numbers 2^k-20311323321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20311323301) 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, 3385220551 + ... + 3385220556.

It is an arithmetic number, because the mean of its divisors is an integer number (6770441108).

Almost surely, 2^20311323321 is an apocalyptic number.

It is an amenable number.

20311323321 is a deficient number, since it is larger than the sum of its proper divisors (6770441111).

20311323321 is an equidigital number, since it uses as much as digits as its factorization.

20311323321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6770441110.

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 20311323321 its reverse (12332311302), we get a palindrome (32643634623).

The spelling of 20311323321 in words is "twenty billion, three hundred eleven million, three hundred twenty-three thousand, three hundred twenty-one".