12000221221 has 4 divisors (see below), whose sum is σ = 12000521952. Its totient is φ = 11999920492.

The previous prime is 12000221213. The next prime is 12000221249. The reversal of 12000221221 is 12212200021.

It is a happy number.

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 12000221221 - 2³ = 12000221213 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 (12000221251) 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, 79321 + ... + 174046.

It is an arithmetic number, because the mean of its divisors is an integer number (3000130488).

Almost surely, 2^12000221221 is an apocalyptic number.

It is an amenable number.

12000221221 is a deficient number, since it is larger than the sum of its proper divisors (300731).

12000221221 is an equidigital number, since it uses as much as digits as its factorization.

12000221221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 300730.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 12000221221 its reverse (12212200021), we get a palindrome (24212421242).

The spelling of 12000221221 in words is "twelve billion, two hundred twenty-one thousand, two hundred twenty-one".