240304021 has 4 divisors (see below), whose sum is σ = 240846912. Its totient is φ = 239761132.

The previous prime is 240304019. The next prime is 240304037. The reversal of 240304021 is 120403042.

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 240304021 - 2¹ = 240304019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 240303986 and 240304004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (240304721) 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 3 ways as a sum of consecutive naturals, for example, 270781 + ... + 271666.

It is an arithmetic number, because the mean of its divisors is an integer number (60211728).

Almost surely, 2^240304021 is an apocalyptic number.

It is an amenable number.

240304021 is a deficient number, since it is larger than the sum of its proper divisors (542891).

240304021 is an equidigital number, since it uses as much as digits as its factorization.

240304021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 542890.

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 240304021 is about 15501.7425149562. The cubic root of 240304021 is about 621.7087971154.

Adding to 240304021 its reverse (120403042), we get a palindrome (360707063).

The spelling of 240304021 in words is "two hundred forty million, three hundred four thousand, twenty-one".