12321221321 has 4 divisors (see below), whose sum is σ = 12459662100. Its totient is φ = 12182780544.

The previous prime is 12321221309. The next prime is 12321221323. The reversal of 12321221321 is 12312212321.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8100900025 + 4220321296 = 90005^2 + 64964^2 .

It is a cyclic number.

It is not a de Polignac number, because 12321221321 - 2¹⁸ = 12320959177 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12321221293 and 12321221302.

It is not an unprimeable number, because it can be changed into a prime (12321221323) 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, 69220256 + ... + 69220433.

It is an arithmetic number, because the mean of its divisors is an integer number (3114915525).

Almost surely, 2^12321221321 is an apocalyptic number.

It is an amenable number.

12321221321 is a deficient number, since it is larger than the sum of its proper divisors (138440779).

12321221321 is an equidigital number, since it uses as much as digits as its factorization.

12321221321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138440778.

The product of its digits is 288, while the sum is 20.

Adding to 12321221321 its reverse (12312212321), we get a palindrome (24633433642).

The spelling of 12321221321 in words is "twelve billion, three hundred twenty-one million, two hundred twenty-one thousand, three hundred twenty-one".