12122222022221 has 4 divisors (see below), whose sum is σ = 12123383944092. Its totient is φ = 12121060100352.

The previous prime is 12122222022143. The next prime is 12122222022227. The reversal of 12122222022221 is 12222022222121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9149046018121 + 2973176004100 = 3024739^2 + 1724290^2 .

It is a cyclic number.

It is not a de Polignac number, because 12122222022221 - 2³⁴ = 12105042153037 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 (12122222022227) 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 3 ways as a sum of consecutive naturals, for example, 580945286 + ... + 580966151.

It is an arithmetic number, because the mean of its divisors is an integer number (3030845986023).

Almost surely, 2^{12122222022221} is an apocalyptic number.

It is an amenable number.

12122222022221 is a deficient number, since it is larger than the sum of its proper divisors (1161921871).

12122222022221 is a wasteful number, since it uses less digits than its factorization.

12122222022221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1161921870.

The product of its (nonzero) digits is 1024, while the sum is 23.

Adding to 12122222022221 its reverse (12222022222121), we get a palindrome (24344244244342).

The spelling of 12122222022221 in words is "twelve trillion, one hundred twenty-two billion, two hundred twenty-two million, twenty-two thousand, two hundred twenty-one".