12012321123221 has 2 divisors, whose sum is σ = 12012321123222. Its totient is φ = 12012321123220.

The previous prime is 12012321123197. The next prime is 12012321123247. The reversal of 12012321123221 is 12232112321021.

12012321123221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6288504120721 + 5723817002500 = 2507689^2 + 2392450^2 .

It is a cyclic number.

It is not a de Polignac number, because 12012321123221 - 2¹⁴ = 12012321106837 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12012321123421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6006160561610 + 6006160561611.

It is an arithmetic number, because the mean of its divisors is an integer number (6006160561611).

Almost surely, 2^{12012321123221} is an apocalyptic number.

It is an amenable number.

12012321123221 is a deficient number, since it is larger than the sum of its proper divisors (1).

12012321123221 is an equidigital number, since it uses as much as digits as its factorization.

12012321123221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 23.

Adding to 12012321123221 its reverse (12232112321021), we get a palindrome (24244433444242).

The spelling of 12012321123221 in words is "twelve trillion, twelve billion, three hundred twenty-one million, one hundred twenty-three thousand, two hundred twenty-one".