240668021 has 24 divisors (see below), whose sum is σ = 279508320. Its totient is φ = 205436000.

The previous prime is 240667993. The next prime is 240668039. The reversal of 240668021 is 120866042.

It is not a de Polignac number, because 240668021 - 2¹⁰ = 240666997 is a prime.

It is a hoax number, since the sum of its digits (29) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (240668321) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 342971 + ... + 343671.

It is an arithmetic number, because the mean of its divisors is an integer number (11646180).

Almost surely, 2^240668021 is an apocalyptic number.

It is an amenable number.

240668021 is a deficient number, since it is larger than the sum of its proper divisors (38840299).

240668021 is a wasteful number, since it uses less digits than its factorization.

240668021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 817 (or 794 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 240668021 is about 15513.4786879023. The cubic root of 240668021 is about 622.0225494387.

The spelling of 240668021 in words is "two hundred forty million, six hundred sixty-eight thousand, twenty-one".