12320312221 has 4 divisors (see below), whose sum is σ = 14080356832. Its totient is φ = 10560267612.

The previous prime is 12320312203. The next prime is 12320312243. The reversal of 12320312221 is 12221302321.

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 12320312221 - 2⁷ = 12320312093 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 (12320313221) 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, 880022295 + ... + 880022308.

It is an arithmetic number, because the mean of its divisors is an integer number (3520089208).

Almost surely, 2^12320312221 is an apocalyptic number.

It is an amenable number.

12320312221 is a deficient number, since it is larger than the sum of its proper divisors (1760044611).

12320312221 is an equidigital number, since it uses as much as digits as its factorization.

12320312221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1760044610.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 12320312221 its reverse (12221302321), we get a palindrome (24541614542).

It can be divided in two parts, 123203 and 12221, that added together give a square (135424 = 368²).

The spelling of 12320312221 in words is "twelve billion, three hundred twenty million, three hundred twelve thousand, two hundred twenty-one".