243324421 has 2 divisors, whose sum is σ = 243324422. Its totient is φ = 243324420.

The previous prime is 243324373. The next prime is 243324427. The reversal of 243324421 is 124423342.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 238084900 + 5239521 = 15430^2 + 2289^2 .

It is a cyclic number.

It is not a de Polignac number, because 243324421 - 2⁹ = 243323909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243324427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121662210 + 121662211.

It is an arithmetic number, because the mean of its divisors is an integer number (121662211).

Almost surely, 2^243324421 is an apocalyptic number.

It is an amenable number.

243324421 is a deficient number, since it is larger than the sum of its proper divisors (1).

243324421 is an equidigital number, since it uses as much as digits as its factorization.

243324421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4608, while the sum is 25.

The square root of 243324421 is about 15598.8596057532. The cubic root of 243324421 is about 624.3027283088.

Adding to 243324421 its reverse (124423342), we get a palindrome (367747763).

The spelling of 243324421 in words is "two hundred forty-three million, three hundred twenty-four thousand, four hundred twenty-one".