243124321 has 4 divisors (see below), whose sum is σ = 265226544. Its totient is φ = 221022100.

The previous prime is 243124319. The next prime is 243124367. The reversal of 243124321 is 123421342.

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 243124321 - 2¹ = 243124319 is a prime.

It is a super-2 number, since 2×243124321² = 118218870923422082, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 243124292 and 243124301.

It is not an unprimeable number, because it can be changed into a prime (243124381) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11051095 + ... + 11051116.

It is an arithmetic number, because the mean of its divisors is an integer number (66306636).

Almost surely, 2^243124321 is an apocalyptic number.

It is an amenable number.

243124321 is a deficient number, since it is larger than the sum of its proper divisors (22102223).

243124321 is a wasteful number, since it uses less digits than its factorization.

243124321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22102222.

The product of its digits is 1152, while the sum is 22.

The square root of 243124321 is about 15592.4443561617. Note that the first 3 decimals coincide. The cubic root of 243124321 is about 624.1315477440.

Adding to 243124321 its reverse (123421342), we get a palindrome (366545663).

The spelling of 243124321 in words is "two hundred forty-three million, one hundred twenty-four thousand, three hundred twenty-one".