20310031321 has 4 divisors (see below), whose sum is σ = 20654269200. Its totient is φ = 19965793444.

The previous prime is 20310031307. The next prime is 20310031351. The reversal of 20310031321 is 12313001302.

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 20310031321 - 2⁹ = 20310030809 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20310031295 and 20310031304.

It is not an unprimeable number, because it can be changed into a prime (20310031351) 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, 172118851 + ... + 172118968.

It is an arithmetic number, because the mean of its divisors is an integer number (5163567300).

Almost surely, 2^20310031321 is an apocalyptic number.

It is an amenable number.

20310031321 is a deficient number, since it is larger than the sum of its proper divisors (344237879).

20310031321 is an equidigital number, since it uses as much as digits as its factorization.

20310031321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 344237878.

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 20310031321 its reverse (12313001302), we get a palindrome (32623032623).

The spelling of 20310031321 in words is "twenty billion, three hundred ten million, thirty-one thousand, three hundred twenty-one".