243423321 has 16 divisors (see below), whose sum is σ = 330782400. Its totient is φ = 159185408.

The previous prime is 243423263. The next prime is 243423347. The reversal of 243423321 is 123324342.

It is a cyclic number.

It is not a de Polignac number, because 243423321 - 2²² = 239229017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 243423291 and 243423300.

It is not an unprimeable number, because it can be changed into a prime (243422321) 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, 99505 + ... + 101921.

It is an arithmetic number, because the mean of its divisors is an integer number (20673900).

Almost surely, 2^243423321 is an apocalyptic number.

It is an amenable number.

243423321 is a deficient number, since it is larger than the sum of its proper divisors (87359079).

243423321 is a wasteful number, since it uses less digits than its factorization.

243423321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3048.

The product of its digits is 3456, while the sum is 24.

The square root of 243423321 is about 15602.0293872304. The cubic root of 243423321 is about 624.3873001412.

Adding to 243423321 its reverse (123324342), we get a palindrome (366747663).

The spelling of 243423321 in words is "two hundred forty-three million, four hundred twenty-three thousand, three hundred twenty-one".