12120011221 has 16 divisors (see below), whose sum is σ = 12621744000. Its totient is φ = 11630443968.

The previous prime is 12120011219. The next prime is 12120011257. The reversal of 12120011221 is 12211002121.

12120011221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 12120011221 - 2¹ = 12120011219 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 (12120011291) 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 15 ways as a sum of consecutive naturals, for example, 612535 + ... + 632011.

It is an arithmetic number, because the mean of its divisors is an integer number (788859000).

Almost surely, 2^12120011221 is an apocalyptic number.

It is an amenable number.

12120011221 is a deficient number, since it is larger than the sum of its proper divisors (501732779).

12120011221 is a wasteful number, since it uses less digits than its factorization.

12120011221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19788.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 12120011221 its reverse (12211002121), we get a palindrome (24331013342).

The spelling of 12120011221 in words is "twelve billion, one hundred twenty million, eleven thousand, two hundred twenty-one".