243221443 has 8 divisors (see below), whose sum is σ = 252904320. Its totient is φ = 233653440.

The previous prime is 243221437. The next prime is 243221449. The reversal of 243221443 is 344122342.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (243221437) and next prime (243221449).

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 243221443 - 2⁵ = 243221411 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243221449) 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 7 ways as a sum of consecutive naturals, for example, 24388 + ... + 32881.

It is an arithmetic number, because the mean of its divisors is an integer number (31613040).

Almost surely, 2^243221443 is an apocalyptic number.

243221443 is a deficient number, since it is larger than the sum of its proper divisors (9682877).

243221443 is a wasteful number, since it uses less digits than its factorization.

243221443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57437.

The product of its digits is 4608, while the sum is 25.

The square root of 243221443 is about 15595.5584382221. The cubic root of 243221443 is about 624.2146449212.

Adding to 243221443 its reverse (344122342), we get a palindrome (587343785).

The spelling of 243221443 in words is "two hundred forty-three million, two hundred twenty-one thousand, four hundred forty-three".