12012222221 has 8 divisors (see below), whose sum is σ = 12151137600. Its totient is φ = 11873394720.

The previous prime is 12012222179. The next prime is 12012222223. The reversal of 12012222221 is 12222221021.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12012222221 - 2¹⁰ = 12012221197 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 12012222221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12012222223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 276200 + ... + 316718.

It is an arithmetic number, because the mean of its divisors is an integer number (1518892200).

Almost surely, 2^12012222221 is an apocalyptic number.

It is an amenable number.

12012222221 is a deficient number, since it is larger than the sum of its proper divisors (138915379).

12012222221 is an equidigital number, since it uses as much as digits as its factorization.

12012222221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43939.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 12012222221 its reverse (12222221021), we get a palindrome (24234443242).

The spelling of 12012222221 in words is "twelve billion, twelve million, two hundred twenty-two thousand, two hundred twenty-one".