243321021023 has 4 divisors (see below), whose sum is σ = 243470574600. Its totient is φ = 243171467448.

The previous prime is 243321020993. The next prime is 243321021037. The reversal of 243321021023 is 320120123342.

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 243321021023 - 2²⁴ = 243304243807 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 243321021023.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243321021623) 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, 74774348 + ... + 74777601.

It is an arithmetic number, because the mean of its divisors is an integer number (60867643650).

Almost surely, 2^243321021023 is an apocalyptic number.

243321021023 is a deficient number, since it is larger than the sum of its proper divisors (149553577).

243321021023 is a wasteful number, since it uses less digits than its factorization.

243321021023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149553576.

The product of its (nonzero) digits is 1728, while the sum is 23.

Adding to 243321021023 its reverse (320120123342), we get a palindrome (563441144365).

The spelling of 243321021023 in words is "two hundred forty-three billion, three hundred twenty-one million, twenty-one thousand, twenty-three".