243331021304321 has 4 divisors (see below), whose sum is σ = 253910630926272. Its totient is φ = 232751411682372.

The previous prime is 243331021304311. The next prime is 243331021304339. The reversal of 243331021304321 is 123403120133342.

243331021304321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243331021304321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243331021304311) 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, 5289804810941 + ... + 5289804810986.

It is an arithmetic number, because the mean of its divisors is an integer number (63477657731568).

Almost surely, 2^{243331021304321} is an apocalyptic number.

It is an amenable number.

243331021304321 is a deficient number, since it is larger than the sum of its proper divisors (10579609621951).

243331021304321 is a wasteful number, since it uses less digits than its factorization.

243331021304321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10579609621950.

The product of its (nonzero) digits is 31104, while the sum is 32.

Adding to 243331021304321 its reverse (123403120133342), we get a palindrome (366734141437663).

The spelling of 243331021304321 in words is "two hundred forty-three trillion, three hundred thirty-one billion, twenty-one million, three hundred four thousand, three hundred twenty-one".