22224444221 has 4 divisors (see below), whose sum is σ = 25399364832. Its totient is φ = 19049523612.

The previous prime is 22224444197. The next prime is 22224444223. The reversal of 22224444221 is 12244442222.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12244442222 = 2 ⋅6122221111.

It is a de Polignac number, because none of the positive numbers 2^k-22224444221 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 (22224444223) 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, 1587460295 + ... + 1587460308.

It is an arithmetic number, because the mean of its divisors is an integer number (6349841208).

Almost surely, 2^22224444221 is an apocalyptic number.

It is an amenable number.

22224444221 is a deficient number, since it is larger than the sum of its proper divisors (3174920611).

22224444221 is an equidigital number, since it uses as much as digits as its factorization.

22224444221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3174920610.

The product of its digits is 16384, while the sum is 29.

Adding to 22224444221 its reverse (12244442222), we get a palindrome (34468886443).

The spelling of 22224444221 in words is "twenty-two billion, two hundred twenty-four million, four hundred forty-four thousand, two hundred twenty-one".