244640221 has 4 divisors (see below), whose sum is σ = 279588832. Its totient is φ = 209691612.

The previous prime is 244640203. The next prime is 244640243. The reversal of 244640221 is 122046442.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 244640221 - 2²⁷ = 110422493 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 (244640261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17474295 + ... + 17474308.

It is an arithmetic number, because the mean of its divisors is an integer number (69897208).

Almost surely, 2^244640221 is an apocalyptic number.

It is an amenable number.

244640221 is a deficient number, since it is larger than the sum of its proper divisors (34948611).

244640221 is an equidigital number, since it uses as much as digits as its factorization.

244640221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34948610.

The product of its (nonzero) digits is 3072, while the sum is 25.

The square root of 244640221 is about 15640.9789015905. The cubic root of 244640221 is about 625.4260314495.

Adding to 244640221 its reverse (122046442), we get a palindrome (366686663).

The spelling of 244640221 in words is "two hundred forty-four million, six hundred forty thousand, two hundred twenty-one".