12122012221021 has 16 divisors (see below), whose sum is σ = 13249349591040. Its totient is φ = 11040719235840.

The previous prime is 12122012221013. The next prime is 12122012221043. The reversal of 12122012221021 is 12012221022121.

It is a cyclic number.

It is not a de Polignac number, because 12122012221021 - 2³ = 12122012221013 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12122012221021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12122012221051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33673860 + ... + 34031938.

It is an arithmetic number, because the mean of its divisors is an integer number (828084349440).

Almost surely, 2^{12122012221021} is an apocalyptic number.

It is an amenable number.

12122012221021 is a deficient number, since it is larger than the sum of its proper divisors (1127337370019).

12122012221021 is a wasteful number, since it uses less digits than its factorization.

12122012221021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 422364.

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

Adding to 12122012221021 its reverse (12012221022121), we get a palindrome (24134233243142).

The spelling of 12122012221021 in words is "twelve trillion, one hundred twenty-two billion, twelve million, two hundred twenty-one thousand, twenty-one".