12243442321 has 4 divisors (see below), whose sum is σ = 13356482544. Its totient is φ = 11130402100.

The previous prime is 12243442307. The next prime is 12243442333. The reversal of 12243442321 is 12324434221.

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 a de Polignac number, because none of the positive numbers 2^k-12243442321 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12243442321.

It is not an unprimeable number, because it can be changed into a prime (12243442361) 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, 556520095 + ... + 556520116.

It is an arithmetic number, because the mean of its divisors is an integer number (3339120636).

Almost surely, 2^12243442321 is an apocalyptic number.

12243442321 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12243442321 is a deficient number, since it is larger than the sum of its proper divisors (1113040223).

12243442321 is a wasteful number, since it uses less digits than its factorization.

12243442321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1113040222.

The product of its digits is 9216, while the sum is 28.

Adding to 12243442321 its reverse (12324434221), we get a palindrome (24567876542).

The spelling of 12243442321 in words is "twelve billion, two hundred forty-three million, four hundred forty-two thousand, three hundred twenty-one".