243052543021 has 4 divisors (see below), whose sum is σ = 257349751452. Its totient is φ = 228755334592.

The previous prime is 243052543009. The next prime is 243052543039. The reversal of 243052543021 is 120345250342.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 120345250342 = 2 ⋅60172625171.

It can be written as a sum of positive squares in 2 ways, for example, as 190719117796 + 52333425225 = 436714^2 + 228765^2 .

It is a cyclic number.

It is not a de Polignac number, because 243052543021 - 2¹⁷ = 243052411949 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 (243052543121) 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, 7148604190 + ... + 7148604223.

It is an arithmetic number, because the mean of its divisors is an integer number (64337437863).

Almost surely, 2^243052543021 is an apocalyptic number.

It is an amenable number.

243052543021 is a deficient number, since it is larger than the sum of its proper divisors (14297208431).

243052543021 is a wasteful number, since it uses less digits than its factorization.

243052543021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14297208430.

The product of its (nonzero) digits is 28800, while the sum is 31.

Adding to 243052543021 its reverse (120345250342), we get a palindrome (363397793363).

The spelling of 243052543021 in words is "two hundred forty-three billion, fifty-two million, five hundred forty-three thousand, twenty-one".