243140321 has 16 divisors (see below), whose sum is σ = 266006400. Its totient is φ = 221356800.

The previous prime is 243140279. The next prime is 243140333. The reversal of 243140321 is 123041342.

It is a cyclic number.

It is not a de Polignac number, because 243140321 - 2¹⁸ = 242878177 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 243140293 and 243140302.

It is not an unprimeable number, because it can be changed into a prime (243140371) 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, 131876 + ... + 133706.

It is an arithmetic number, because the mean of its divisors is an integer number (16625400).

Almost surely, 2^243140321 is an apocalyptic number.

It is an amenable number.

243140321 is a deficient number, since it is larger than the sum of its proper divisors (22866079).

243140321 is a wasteful number, since it uses less digits than its factorization.

243140321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2120.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 243140321 is about 15592.9574167314. The cubic root of 243140321 is about 624.1452387995.

Adding to 243140321 its reverse (123041342), we get a palindrome (366181663).

The spelling of 243140321 in words is "two hundred forty-three million, one hundred forty thousand, three hundred twenty-one".