243144020321 has 2 divisors, whose sum is σ = 243144020322. Its totient is φ = 243144020320.

The previous prime is 243144020279. The next prime is 243144020323. The reversal of 243144020321 is 123020441342.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 229978752721 + 13165267600 = 479561^2 + 114740^2 .

It is a cyclic number.

It is not a de Polignac number, because 243144020321 - 2¹⁸ = 243143758177 is a prime.

Together with 243144020323, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (243144020323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121572010160 + 121572010161.

It is an arithmetic number, because the mean of its divisors is an integer number (121572010161).

Almost surely, 2^243144020321 is an apocalyptic number.

It is an amenable number.

243144020321 is a deficient number, since it is larger than the sum of its proper divisors (1).

243144020321 is an equidigital number, since it uses as much as digits as its factorization.

243144020321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4608, while the sum is 26.

Adding to 243144020321 its reverse (123020441342), we get a palindrome (366164461663).

The spelling of 243144020321 in words is "two hundred forty-three billion, one hundred forty-four million, twenty thousand, three hundred twenty-one".