22112212121 has 4 divisors (see below), whose sum is σ = 23073612672. Its totient is φ = 21150811572.

The previous prime is 22112212099. The next prime is 22112212159. The reversal of 22112212121 is 12121221122.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 22112212121 - 2¹⁰ = 22112211097 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 22112212121.

It is not an unprimeable number, because it can be changed into a prime (22112212621) 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, 480700241 + ... + 480700286.

It is an arithmetic number, because the mean of its divisors is an integer number (5768403168).

Almost surely, 2^22112212121 is an apocalyptic number.

It is an amenable number.

22112212121 is a deficient number, since it is larger than the sum of its proper divisors (961400551).

22112212121 is an equidigital number, since it uses as much as digits as its factorization.

22112212121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 961400550.

The product of its digits is 64, while the sum is 17.

Adding to 22112212121 its reverse (12121221122), we get a palindrome (34233433243).

Subtracting from 22112212121 its reverse (12121221122), we obtain a palindrome (9990990999).

The spelling of 22112212121 in words is "twenty-two billion, one hundred twelve million, two hundred twelve thousand, one hundred twenty-one".