24240221 has 4 divisors (see below), whose sum is σ = 24366012. Its totient is φ = 24114432.

The previous prime is 24240211. The next prime is 24240247. The reversal of 24240221 is 12204242.

It is a happy number.

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 8637721 + 15602500 = 2939^2 + 3950^2 .

It is a cyclic number.

It is not a de Polignac number, because 24240221 - 2¹⁸ = 23978077 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 24240221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (24240211) 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, 62606 + ... + 62991.

It is an arithmetic number, because the mean of its divisors is an integer number (6091503).

Almost surely, 2^24240221 is an apocalyptic number.

It is an amenable number.

24240221 is a deficient number, since it is larger than the sum of its proper divisors (125791).

24240221 is a wasteful number, since it uses less digits than its factorization.

24240221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125790.

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

The square root of 24240221 is about 4923.4358937636. The cubic root of 24240221 is about 289.4091059882.

Adding to 24240221 its reverse (12204242), we get a palindrome (36444463).

The spelling of 24240221 in words is "twenty-four million, two hundred forty thousand, two hundred twenty-one".