22012122221 has 8 divisors (see below), whose sum is σ = 22100973720. Its totient is φ = 21923364672.

The previous prime is 22012122211. The next prime is 22012122227. The reversal of 22012122221 is 12222121022.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 2964258025 + 19047864196 = 54445^2 + 138014^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 22012122221 - 2⁶ = 22012122157 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 22012122221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22012122227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 466511 + ... + 511523.

It is an arithmetic number, because the mean of its divisors is an integer number (2762621715).

Almost surely, 2^22012122221 is an apocalyptic number.

It is an amenable number.

22012122221 is a deficient number, since it is larger than the sum of its proper divisors (88851499).

22012122221 is a wasteful number, since it uses less digits than its factorization.

22012122221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46975.

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

Adding to 22012122221 its reverse (12222121022), we get a palindrome (34234243243).

The spelling of 22012122221 in words is "twenty-two billion, twelve million, one hundred twenty-two thousand, two hundred twenty-one".