242420321 has 24 divisors (see below), whose sum is σ = 290305344. Its totient is φ = 199571040.

The previous prime is 242420317. The next prime is 242420333. The reversal of 242420321 is 123024242.

It is not a de Polignac number, because 242420321 - 2² = 242420317 is a prime.

It is a super-2 number, since 2×242420321² = 117535224067486082, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 242420293 and 242420302.

It is not an unprimeable number, because it can be changed into a prime (242420351) 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 23 ways as a sum of consecutive naturals, for example, 497540 + ... + 498026.

It is an arithmetic number, because the mean of its divisors is an integer number (12096056).

Almost surely, 2^242420321 is an apocalyptic number.

It is an amenable number.

242420321 is a deficient number, since it is larger than the sum of its proper divisors (47885023).

242420321 is a wasteful number, since it uses less digits than its factorization.

242420321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 629 (or 570 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 242420321 is about 15569.8529537051. The cubic root of 242420321 is about 623.5285456875.

Adding to 242420321 its reverse (123024242), we get a palindrome (365444563).

The spelling of 242420321 in words is "two hundred forty-two million, four hundred twenty thousand, three hundred twenty-one".