242440321 has 4 divisors (see below), whose sum is σ = 248078512. Its totient is φ = 236802132.

The previous prime is 242440301. The next prime is 242440343. The reversal of 242440321 is 123044242.

It is a happy number.

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 not a de Polignac number, because 242440321 - 2¹³ = 242432129 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 242440292 and 242440301.

It is not an unprimeable number, because it can be changed into a prime (242440301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2819031 + ... + 2819116.

It is an arithmetic number, because the mean of its divisors is an integer number (62019628).

Almost surely, 2^242440321 is an apocalyptic number.

It is an amenable number.

242440321 is a deficient number, since it is larger than the sum of its proper divisors (5638191).

242440321 is an equidigital number, since it uses as much as digits as its factorization.

242440321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5638190.

The product of its (nonzero) digits is 1536, while the sum is 22.

The square root of 242440321 is about 15570.4952072823. The cubic root of 242440321 is about 623.5456925284.

Adding to 242440321 its reverse (123044242), we get a palindrome (365484563).

The spelling of 242440321 in words is "two hundred forty-two million, four hundred forty thousand, three hundred twenty-one".