243142012123 has 4 divisors (see below), whose sum is σ = 243310979520. Its totient is φ = 242973044728.

The previous prime is 243142012109. The next prime is 243142012129. The reversal of 243142012123 is 321210241342.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 321210241342 = 2 ⋅160605120671.

It is a cyclic number.

It is not a de Polignac number, because 243142012123 - 2³³ = 234552077531 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243142012129) 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, 84481540 + ... + 84484417.

It is an arithmetic number, because the mean of its divisors is an integer number (60827744880).

Almost surely, 2^243142012123 is an apocalyptic number.

243142012123 is a deficient number, since it is larger than the sum of its proper divisors (168967397).

243142012123 is a wasteful number, since it uses less digits than its factorization.

243142012123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168967396.

The product of its (nonzero) digits is 2304, while the sum is 25.

Adding to 243142012123 its reverse (321210241342), we get a palindrome (564352253465).

The spelling of 243142012123 in words is "two hundred forty-three billion, one hundred forty-two million, twelve thousand, one hundred twenty-three".