221324244 has 12 divisors (see below), whose sum is σ = 516423264. Its totient is φ = 73774744.

The previous prime is 221324227. The next prime is 221324261. The reversal of 221324244 is 442423122.

It is an interprime number because it is at equal distance from previous prime (221324227) and next prime (221324261).

It is a tau number, because it is divible by the number of its divisors (12).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

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, 9221832 + ... + 9221855.

It is an arithmetic number, because the mean of its divisors is an integer number (43035272).

Almost surely, 2^221324244 is an apocalyptic number.

It is an amenable number.

221324244 is an abundant number, since it is smaller than the sum of its proper divisors (295099020).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221324244 is a wasteful number, since it uses less digits than its factorization.

221324244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18443694 (or 18443692 counting only the distinct ones).

The product of its digits is 3072, while the sum is 24.

The square root of 221324244 is about 14876.9702560703. The cubic root of 221324244 is about 604.8898954972.

Adding to 221324244 its reverse (442423122), we get a palindrome (663747366).

The spelling of 221324244 in words is "two hundred twenty-one million, three hundred twenty-four thousand, two hundred forty-four".