22224221 has 8 divisors (see below), whose sum is σ = 22554720. Its totient is φ = 21896208.

The previous prime is 22224217. The next prime is 22224229. The reversal of 22224221 is 12242222.

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 22224221 - 2² = 22224217 is a prime.

It is a Duffinian number.

It is a zygodrome in base 3.

It is a self number, because there is not a number n which added to its sum of digits gives 22224221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22224229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24050 + ... + 24956.

It is an arithmetic number, because the mean of its divisors is an integer number (2819340).

Almost surely, 2^22224221 is an apocalyptic number.

It is an amenable number.

22224221 is a deficient number, since it is larger than the sum of its proper divisors (330499).

22224221 is a wasteful number, since it uses less digits than its factorization.

22224221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1243.

The product of its digits is 256, while the sum is 17.

The square root of 22224221 is about 4714.2572055415. The cubic root of 22224221 is about 281.1526506869.

Adding to 22224221 its reverse (12242222), we get a palindrome (34466443).

The spelling of 22224221 in words is "twenty-two million, two hundred twenty-four thousand, two hundred twenty-one".