12012021221221 has 12 divisors (see below), whose sum is σ = 14580696568032. Its totient is φ = 9848365223928.

The previous prime is 12012021221219. The next prime is 12012021221231. The reversal of 12012021221221 is 12212212021021.

It is not a de Polignac number, because 12012021221221 - 2¹ = 12012021221219 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12012021221201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5329200835 + ... + 5329203088.

It is an arithmetic number, because the mean of its divisors is an integer number (1215058047336).

Almost surely, 2^{12012021221221} is an apocalyptic number.

It is an amenable number.

12012021221221 is a deficient number, since it is larger than the sum of its proper divisors (2568675346811).

12012021221221 is a wasteful number, since it uses less digits than its factorization.

12012021221221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10658403960 (or 10658403953 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 12012021221221 its reverse (12212212021021), we get a palindrome (24224233242242).

The spelling of 12012021221221 in words is "twelve trillion, twelve billion, twenty-one million, two hundred twenty-one thousand, two hundred twenty-one".