12111101221 has 8 divisors (see below), whose sum is σ = 12366095040. Its totient is φ = 11858750112.

The previous prime is 12111101213. The next prime is 12111101227. The reversal of 12111101221 is 12210111121.

It is a happy number.

12111101221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 12111101221 - 2³ = 12111101213 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 (12111101227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 651415 + ... + 669748.

It is an arithmetic number, because the mean of its divisors is an integer number (1545761880).

Almost surely, 2^12111101221 is an apocalyptic number.

It is an amenable number.

12111101221 is a deficient number, since it is larger than the sum of its proper divisors (254993819).

12111101221 is a wasteful number, since it uses less digits than its factorization.

12111101221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1321355.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 12111101221 its reverse (12210111121), we get a palindrome (24321212342).

The spelling of 12111101221 in words is "twelve billion, one hundred eleven million, one hundred one thousand, two hundred twenty-one".