243204312011 has 4 divisors (see below), whose sum is σ = 243219936624. Its totient is φ = 243188687400.

The previous prime is 243204311899. The next prime is 243204312047. The reversal of 243204312011 is 110213402342.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 243204312011 - 2¹⁸ = 243204049867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243204312061) 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, 7788935 + ... + 7820096.

It is an arithmetic number, because the mean of its divisors is an integer number (60804984156).

Almost surely, 2^243204312011 is an apocalyptic number.

243204312011 is a deficient number, since it is larger than the sum of its proper divisors (15624613).

243204312011 is a wasteful number, since it uses less digits than its factorization.

243204312011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15624612.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 243204312011 its reverse (110213402342), we get a palindrome (353417714353).

The spelling of 243204312011 in words is "two hundred forty-three billion, two hundred four million, three hundred twelve thousand, eleven".