242440621 has 8 divisors (see below), whose sum is σ = 256842360. Its totient is φ = 228054528.

The previous prime is 242440607. The next prime is 242440633. The reversal of 242440621 is 126044242.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 175430025 + 67010596 = 13245^2 + 8186^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 242440621 - 2⁹ = 242440109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (242440691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47145 + ... + 52033.

It is an arithmetic number, because the mean of its divisors is an integer number (32105295).

Almost surely, 2^242440621 is an apocalyptic number.

It is an amenable number.

242440621 is a deficient number, since it is larger than the sum of its proper divisors (14401739).

242440621 is a wasteful number, since it uses less digits than its factorization.

242440621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7823.

The product of its (nonzero) digits is 3072, while the sum is 25.

The square root of 242440621 is about 15570.5048408843. The cubic root of 242440621 is about 623.5459497238.

Adding to 242440621 its reverse (126044242), we get a palindrome (368484863).

The spelling of 242440621 in words is "two hundred forty-two million, four hundred forty thousand, six hundred twenty-one".