243021135 has 24 divisors (see below), whose sum is σ = 452318256. Its totient is φ = 111095040.

The previous prime is 243021091. The next prime is 243021139. The reversal of 243021135 is 531120342.

It is not a de Polignac number, because 243021135 - 2⁶ = 243021071 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243021139) 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 in 23 ways as a sum of consecutive naturals, for example, 164586 + ... + 166055.

It is an arithmetic number, because the mean of its divisors is an integer number (18846594).

Almost surely, 2^243021135 is an apocalyptic number.

243021135 is a deficient number, since it is larger than the sum of its proper divisors (209297121).

243021135 is a wasteful number, since it uses less digits than its factorization.

243021135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330663 (or 330656 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 243021135 is about 15589.1351588214. The cubic root of 243021135 is about 624.0432379843.

Adding to 243021135 its reverse (531120342), we get a palindrome (774141477).

The spelling of 243021135 in words is "two hundred forty-three million, twenty-one thousand, one hundred thirty-five".