22222012121 has 4 divisors (see below), whose sum is σ = 22223291700. Its totient is φ = 22220732544.

The previous prime is 22222012067. The next prime is 22222012157. The reversal of 22222012121 is 12121022222.

It is a happy number.

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 19688299225 + 2533712896 = 140315^2 + 50336^2 .

It is a cyclic number.

It is not a de Polignac number, because 22222012121 - 2²⁶ = 22154903257 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 22222012121.

It is not an unprimeable number, because it can be changed into a prime (22222015121) 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 3 ways as a sum of consecutive naturals, for example, 613376 + ... + 648593.

It is an arithmetic number, because the mean of its divisors is an integer number (5555822925).

Almost surely, 2^22222012121 is an apocalyptic number.

It is an amenable number.

22222012121 is a deficient number, since it is larger than the sum of its proper divisors (1279579).

22222012121 is a wasteful number, since it uses less digits than its factorization.

22222012121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1279578.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 22222012121 its reverse (12121022222), we get a palindrome (34343034343).

The spelling of 22222012121 in words is "twenty-two billion, two hundred twenty-two million, twelve thousand, one hundred twenty-one".