4240240021 has 4 divisors (see below), whose sum is σ = 4241221600. Its totient is φ = 4239258444.

The previous prime is 4240240001. The next prime is 4240240027. The reversal of 4240240021 is 1200420424.

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 4240240021 - 2⁷ = 4240239893 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 (4240240027) 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, 484281 + ... + 492958.

It is an arithmetic number, because the mean of its divisors is an integer number (1060305400).

Almost surely, 2^4240240021 is an apocalyptic number.

It is an amenable number.

4240240021 is a deficient number, since it is larger than the sum of its proper divisors (981579).

4240240021 is an equidigital number, since it uses as much as digits as its factorization.

4240240021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 981578.

The product of its (nonzero) digits is 512, while the sum is 19.

The square root of 4240240021 is about 65117.1254049194. The cubic root of 4240240021 is about 1618.5650073953.

Adding to 4240240021 its reverse (1200420424), we get a palindrome (5440660445).

The spelling of 4240240021 in words is "four billion, two hundred forty million, two hundred forty thousand, twenty-one".