240442021 has 8 divisors (see below), whose sum is σ = 247434264. Its totient is φ = 233475840.

The previous prime is 240442009. The next prime is 240442031. The reversal of 240442021 is 120244042.

It can be written as a sum of positive squares in 4 ways, for example, as 79405921 + 161036100 = 8911^2 + 12690^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 240442021 - 2¹¹ = 240439973 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 240442021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (240442031) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13041 + ... + 25513.

It is an arithmetic number, because the mean of its divisors is an integer number (30929283).

Almost surely, 2^240442021 is an apocalyptic number.

It is an amenable number.

240442021 is a deficient number, since it is larger than the sum of its proper divisors (6992243).

240442021 is a wasteful number, since it uses less digits than its factorization.

240442021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13031.

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

The square root of 240442021 is about 15506.1929886094. The cubic root of 240442021 is about 621.8277844375.

Adding to 240442021 its reverse (120244042), we get a palindrome (360686063).

The spelling of 240442021 in words is "two hundred forty million, four hundred forty-two thousand, twenty-one".