20321110231 has 4 divisors (see below), whose sum is σ = 21021838200. Its totient is φ = 19620382264.

The previous prime is 20321110193. The next prime is 20321110241. The reversal of 20321110231 is 13201112302.

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 20321110231 - 2⁹ = 20321109719 is a prime.

It is a super-2 number, since 2×20321110231² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20321110241) 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, 350363941 + ... + 350363998.

It is an arithmetic number, because the mean of its divisors is an integer number (5255459550).

Almost surely, 2^20321110231 is an apocalyptic number.

20321110231 is a deficient number, since it is larger than the sum of its proper divisors (700727969).

20321110231 is an equidigital number, since it uses as much as digits as its factorization.

20321110231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 700727968.

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

Adding to 20321110231 its reverse (13201112302), we get a palindrome (33522222533).

The spelling of 20321110231 in words is "twenty billion, three hundred twenty-one million, one hundred ten thousand, two hundred thirty-one".