20321012311 has 4 divisors (see below), whose sum is σ = 20607223824. Its totient is φ = 20034800800.

The previous prime is 20321012293. The next prime is 20321012323. The reversal of 20321012311 is 11321012302.

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

It is a cyclic number.

It is not a de Polignac number, because 20321012311 - 2¹⁵ = 20320979543 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20321012911) 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, 143105650 + ... + 143105791.

It is an arithmetic number, because the mean of its divisors is an integer number (5151805956).

Almost surely, 2^20321012311 is an apocalyptic number.

20321012311 is a deficient number, since it is larger than the sum of its proper divisors (286211513).

20321012311 is an equidigital number, since it uses as much as digits as its factorization.

20321012311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 286211512.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 20321012311 its reverse (11321012302), we get a palindrome (31642024613).

Subtracting from 20321012311 its reverse (11321012302), we obtain a palindrome (9000000009).

The spelling of 20321012311 in words is "twenty billion, three hundred twenty-one million, twelve thousand, three hundred eleven".