12320311021 has 4 divisors (see below), whose sum is σ = 12417321472. Its totient is φ = 12223300572.

The previous prime is 12320310983. The next prime is 12320311051. The reversal of 12320311021 is 12011302321.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12011302321 = 5387 ⋅2229683.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12320311021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12320310986 and 12320311004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12320311051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48505035 + ... + 48505288.

It is an arithmetic number, because the mean of its divisors is an integer number (3104330368).

Almost surely, 2^12320311021 is an apocalyptic number.

It is an amenable number.

12320311021 is a deficient number, since it is larger than the sum of its proper divisors (97010451).

12320311021 is an equidigital number, since it uses as much as digits as its factorization.

12320311021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97010450.

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

Adding to 12320311021 its reverse (12011302321), we get a palindrome (24331613342).

The spelling of 12320311021 in words is "twelve billion, three hundred twenty million, three hundred eleven thousand, twenty-one".