12012242112221 has 16 divisors (see below), whose sum is σ = 13385504890800. Its totient is φ = 10703337996288.

The previous prime is 12012242112127. The next prime is 12012242112257. The reversal of 12012242112221 is 12221124221021.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 2125078795225 + 9887163316996 = 1457765^2 + 3144386^2 .

It is a cyclic number.

It is not a de Polignac number, because 12012242112221 - 2²⁶ = 12012175003357 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 (12012242115221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2172836 + ... + 5361501.

It is an arithmetic number, because the mean of its divisors is an integer number (836594055675).

Almost surely, 2^{12012242112221} is an apocalyptic number.

It is an amenable number.

12012242112221 is a deficient number, since it is larger than the sum of its proper divisors (1373262778579).

12012242112221 is a wasteful number, since it uses less digits than its factorization.

12012242112221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7538608.

The product of its (nonzero) digits is 512, while the sum is 23.

Adding to 12012242112221 its reverse (12221124221021), we get a palindrome (24233366333242).

The spelling of 12012242112221 in words is "twelve trillion, twelve billion, two hundred forty-two million, one hundred twelve thousand, two hundred twenty-one".