22440221 has 8 divisors (see below), whose sum is σ = 23819904. Its totient is φ = 21067200.

The previous prime is 22440179. The next prime is 22440239. The reversal of 22440221 is 12204422.

It is a happy number.

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 22440221 - 2¹⁴ = 22423837 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

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 22440221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22440251) 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, 6446 + ... + 9296.

It is an arithmetic number, because the mean of its divisors is an integer number (2977488).

Almost surely, 2^22440221 is an apocalyptic number.

It is an amenable number.

22440221 is a deficient number, since it is larger than the sum of its proper divisors (1379683).

22440221 is a wasteful number, since it uses less digits than its factorization.

22440221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3331.

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

The square root of 22440221 is about 4737.1110394417. Note that the first 3 decimals coincide. The cubic root of 22440221 is about 282.0605682822.

Adding to 22440221 its reverse (12204422), we get a palindrome (34644643).

The spelling of 22440221 in words is "twenty-two million, four hundred forty thousand, two hundred twenty-one".