12122221122221 has 16 divisors (see below), whose sum is σ = 13976859888768. Its totient is φ = 10298309414400.

The previous prime is 12122221122211. The next prime is 12122221122283. The reversal of 12122221122221 is 12222112222121.

12122221122221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12122221122221 - 2³⁸ = 11847343215277 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12122221122211) 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, 46357481 + ... + 46618241.

It is an arithmetic number, because the mean of its divisors is an integer number (873553743048).

Almost surely, 2^{12122221122221} is an apocalyptic number.

It is an amenable number.

12122221122221 is a deficient number, since it is larger than the sum of its proper divisors (1854638766547).

12122221122221 is a wasteful number, since it uses less digits than its factorization.

12122221122221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 319652.

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

Adding to 12122221122221 its reverse (12222112222121), we get a palindrome (24344333344342).

The spelling of 12122221122221 in words is "twelve trillion, one hundred twenty-two billion, two hundred twenty-one million, one hundred twenty-two thousand, two hundred twenty-one".