243021043 has 2 divisors, whose sum is σ = 243021044. Its totient is φ = 243021042.

The previous prime is 243021041. The next prime is 243021047. The reversal of 243021043 is 340120342.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 243021043 - 2¹ = 243021041 is a prime.

Together with 243021041, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 243021043.

It is not a weakly prime, because it can be changed into another prime (243021041) 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 as a sum of consecutive naturals, namely, 121510521 + 121510522.

It is an arithmetic number, because the mean of its divisors is an integer number (121510522).

Almost surely, 2^243021043 is an apocalyptic number.

243021043 is a deficient number, since it is larger than the sum of its proper divisors (1).

243021043 is an equidigital number, since it uses as much as digits as its factorization.

243021043 is an odious number, because the sum of its binary digits is odd.

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

The square root of 243021043 is about 15589.1322080480. The cubic root of 243021043 is about 624.0431592368.

Adding to 243021043 its reverse (340120342), we get a palindrome (583141385).

The spelling of 243021043 in words is "two hundred forty-three million, twenty-one thousand, forty-three".