243240330213 has 16 divisors (see below), whose sum is σ = 376023699840. Its totient is φ = 155109775392.

The previous prime is 243240330209. The next prime is 243240330233. The reversal of 243240330213 is 312033042342.

243240330213 is a `hidden beast` number, since 2 + 4 + 324 + 0 + 330 + 2 + 1 + 3 = 666.

It is not a de Polignac number, because 243240330213 - 2² = 243240330209 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243240330233) 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 15 ways as a sum of consecutive naturals, for example, 195845056 + ... + 195846297.

It is an arithmetic number, because the mean of its divisors is an integer number (23501481240).

Almost surely, 2^243240330213 is an apocalyptic number.

243240330213 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

243240330213 is a deficient number, since it is larger than the sum of its proper divisors (132783369627).

243240330213 is a wasteful number, since it uses less digits than its factorization.

243240330213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 391691385 (or 391691379 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 27.

Adding to 243240330213 its reverse (312033042342), we get a palindrome (555273372555).

The spelling of 243240330213 in words is "two hundred forty-three billion, two hundred forty million, three hundred thirty thousand, two hundred thirteen".