240306021 has 10 divisors (see below), whose sum is σ = 358975782. Its totient is φ = 160203960.

The previous prime is 240305983. The next prime is 240306029. The reversal of 240306021 is 120603042.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 239909121 + 396900 = 15489^2 + 630^2 .

It is not a de Polignac number, because 240306021 - 2⁹ = 240305509 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 240305985 and 240306003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (240306029) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1483290 + ... + 1483451.

Almost surely, 2^240306021 is an apocalyptic number.

It is an amenable number.

240306021 is a deficient number, since it is larger than the sum of its proper divisors (118669761).

240306021 is an equidigital number, since it uses as much as digits as its factorization.

240306021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2966753 (or 2966744 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 240306021 is about 15501.8070236989. The cubic root of 240306021 is about 621.7105218946.

Adding to 240306021 its reverse (120603042), we get a palindrome (360909063).

The spelling of 240306021 in words is "two hundred forty million, three hundred six thousand, twenty-one".