22424221 has 4 divisors (see below), whose sum is σ = 23197500. Its totient is φ = 21650944.

The previous prime is 22424219. The next prime is 22424231. The reversal of 22424221 is 12242422.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10272025 + 12152196 = 3205^2 + 3486^2 .

It is a cyclic number.

It is not a de Polignac number, because 22424221 - 2¹ = 22424219 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 (22424231) 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 3 ways as a sum of consecutive naturals, for example, 386596 + ... + 386653.

It is an arithmetic number, because the mean of its divisors is an integer number (5799375).

Almost surely, 2^22424221 is an apocalyptic number.

It is an amenable number.

22424221 is a deficient number, since it is larger than the sum of its proper divisors (773279).

22424221 is an equidigital number, since it uses as much as digits as its factorization.

22424221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 773278.

The product of its digits is 512, while the sum is 19.

The square root of 22424221 is about 4735.4219452970. The cubic root of 22424221 is about 281.9935154353.

Adding to 22424221 its reverse (12242422), we get a palindrome (34666643).

The spelling of 22424221 in words is "twenty-two million, four hundred twenty-four thousand, two hundred twenty-one".