243422321 has 2 divisors, whose sum is σ = 243422322. Its totient is φ = 243422320.

The previous prime is 243422299. The next prime is 243422327. The reversal of 243422321 is 123224342.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 194212096 + 49210225 = 13936^2 + 7015^2 .

It is a cyclic number.

It is not a de Polignac number, because 243422321 - 2¹⁴ = 243405937 is a prime.

It is a super-2 number, since 2×243422321² = 118508852722054082, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (243422327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121711160 + 121711161.

It is an arithmetic number, because the mean of its divisors is an integer number (121711161).

Almost surely, 2^243422321 is an apocalyptic number.

It is an amenable number.

243422321 is a deficient number, since it is larger than the sum of its proper divisors (1).

243422321 is an equidigital number, since it uses as much as digits as its factorization.

243422321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2304, while the sum is 23.

The square root of 243422321 is about 15601.9973400844. The cubic root of 243422321 is about 624.3864451311.

Adding to 243422321 its reverse (123224342), we get a palindrome (366646663).

The spelling of 243422321 in words is "two hundred forty-three million, four hundred twenty-two thousand, three hundred twenty-one".