243023221 has 16 divisors (see below), whose sum is σ = 290361600. Its totient is φ = 198874368.

The previous prime is 243023213. The next prime is 243023251. The reversal of 243023221 is 122320342.

It is not a de Polignac number, because 243023221 - 2³ = 243023213 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 (243023201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 113085 + ... + 115213.

It is an arithmetic number, because the mean of its divisors is an integer number (18147600).

Almost surely, 2^243023221 is an apocalyptic number.

It is an amenable number.

243023221 is a deficient number, since it is larger than the sum of its proper divisors (47338379).

243023221 is a wasteful number, since it uses less digits than its factorization.

243023221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2868.

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 243023221 is about 15589.2020642495. The cubic root of 243023221 is about 624.0450234950.

Adding to 243023221 its reverse (122320342), we get a palindrome (365343563).

It can be divided in two parts, 2430 and 23221, that added together give a triangular number (25651 = T₂₂₆).

The spelling of 243023221 in words is "two hundred forty-three million, twenty-three thousand, two hundred twenty-one".