242520321 has 4 divisors (see below), whose sum is σ = 323360432. Its totient is φ = 161680212.

The previous prime is 242520319. The next prime is 242520331. The reversal of 242520321 is 123025242.

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 not a de Polignac number, because 242520321 - 2¹ = 242520319 is a prime.

It is a super-2 number, since 2×242520321² = 117632212195886082, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (242520331) 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 in 3 ways as a sum of consecutive naturals, for example, 40420051 + ... + 40420056.

It is an arithmetic number, because the mean of its divisors is an integer number (80840108).

Almost surely, 2^242520321 is an apocalyptic number.

It is an amenable number.

242520321 is a deficient number, since it is larger than the sum of its proper divisors (80840111).

242520321 is an equidigital number, since it uses as much as digits as its factorization.

242520321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80840110.

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 242520321 is about 15573.0639567171. The cubic root of 242520321 is about 623.6142704632.

Adding to 242520321 its reverse (123025242), we get a palindrome (365545563).

The spelling of 242520321 in words is "two hundred forty-two million, five hundred twenty thousand, three hundred twenty-one".