240013040021 has 4 divisors (see below), whose sum is σ = 240337821600. Its totient is φ = 239688258444.

The previous prime is 240013040009. The next prime is 240013040107. The reversal of 240013040021 is 120040310042.

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 240013040021 - 2²⁶ = 239945931157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (240013040321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 162389681 + ... + 162391158.

It is an arithmetic number, because the mean of its divisors is an integer number (60084455400).

Almost surely, 2^240013040021 is an apocalyptic number.

It is an amenable number.

240013040021 is a deficient number, since it is larger than the sum of its proper divisors (324781579).

240013040021 is an equidigital number, since it uses as much as digits as its factorization.

240013040021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 324781578.

The product of its (nonzero) digits is 192, while the sum is 17.

Adding to 240013040021 its reverse (120040310042), we get a palindrome (360053350063).

The spelling of 240013040021 in words is "two hundred forty billion, thirteen million, forty thousand, twenty-one".