12321323221 has 4 divisors (see below), whose sum is σ = 12350590444. Its totient is φ = 12292056000.

The previous prime is 12321323159. The next prime is 12321323297. The reversal of 12321323221 is 12232312321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12232312321 = 41 ⋅298349081.

It can be written as a sum of positive squares in 2 ways, for example, as 1327800721 + 10993522500 = 36439^2 + 104850^2 .

It is a cyclic number.

It is not a de Polignac number, because 12321323221 - 2¹⁵ = 12321290453 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12321323192 and 12321323201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12321329221) 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, 14632980 + ... + 14633821.

It is an arithmetic number, because the mean of its divisors is an integer number (3087647611).

Almost surely, 2^12321323221 is an apocalyptic number.

It is an amenable number.

12321323221 is a deficient number, since it is larger than the sum of its proper divisors (29267223).

12321323221 is an equidigital number, since it uses as much as digits as its factorization.

12321323221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29267222.

The product of its digits is 864, while the sum is 22.

Adding to 12321323221 its reverse (12232312321), we get a palindrome (24553635542).

The spelling of 12321323221 in words is "twelve billion, three hundred twenty-one million, three hundred twenty-three thousand, two hundred twenty-one".