12239804221 has 4 divisors (see below), whose sum is σ = 12245947612. Its totient is φ = 12233660832.

The previous prime is 12239804173. The next prime is 12239804233. The reversal of 12239804221 is 12240893221.

It is a happy number.

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 8751602500 + 3488201721 = 93550^2 + 59061^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12239804221 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 (12239801221) 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, 3068706 + ... + 3072691.

It is an arithmetic number, because the mean of its divisors is an integer number (3061486903).

Almost surely, 2^12239804221 is an apocalyptic number.

It is an amenable number.

12239804221 is a deficient number, since it is larger than the sum of its proper divisors (6143391).

12239804221 is an equidigital number, since it uses as much as digits as its factorization.

12239804221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6143390.

The product of its (nonzero) digits is 13824, while the sum is 34.

The spelling of 12239804221 in words is "twelve billion, two hundred thirty-nine million, eight hundred four thousand, two hundred twenty-one".