243421440023 has 4 divisors (see below), whose sum is σ = 244122943080. Its totient is φ = 242719936968.

The previous prime is 243421439897. The next prime is 243421440037. The reversal of 243421440023 is 320044124342.

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 243421440023 - 2²² = 243417245719 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243421440923) 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 3 ways as a sum of consecutive naturals, for example, 350751008 + ... + 350751701.

It is an arithmetic number, because the mean of its divisors is an integer number (61030735770).

Almost surely, 2^243421440023 is an apocalyptic number.

243421440023 is a deficient number, since it is larger than the sum of its proper divisors (701503057).

243421440023 is an equidigital number, since it uses as much as digits as its factorization.

243421440023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 701503056.

The product of its (nonzero) digits is 18432, while the sum is 29.

Adding to 243421440023 its reverse (320044124342), we get a palindrome (563465564365).

The spelling of 243421440023 in words is "two hundred forty-three billion, four hundred twenty-one million, four hundred forty thousand, twenty-three".