243321312043 has 4 divisors (see below), whose sum is σ = 246748372848. Its totient is φ = 239894251240.

The previous prime is 243321312029. The next prime is 243321312079. The reversal of 243321312043 is 340213123342.

It is a happy number.

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 243321312043 - 2¹³ = 243321303851 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243321312643) 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, 1713530296 + ... + 1713530437.

It is an arithmetic number, because the mean of its divisors is an integer number (61687093212).

Almost surely, 2^243321312043 is an apocalyptic number.

243321312043 is a deficient number, since it is larger than the sum of its proper divisors (3427060805).

243321312043 is an equidigital number, since it uses as much as digits as its factorization.

243321312043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3427060804.

The product of its (nonzero) digits is 10368, while the sum is 28.

Adding to 243321312043 its reverse (340213123342), we get a palindrome (583534435385).

The spelling of 243321312043 in words is "two hundred forty-three billion, three hundred twenty-one million, three hundred twelve thousand, forty-three".