240343021 has 4 divisors (see below), whose sum is σ = 240378844. Its totient is φ = 240307200.

The previous prime is 240343013. The next prime is 240343063. The reversal of 240343021 is 120343042.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 172922500 + 67420521 = 13150^2 + 8211^2 .

It is a cyclic number.

It is not a de Polignac number, because 240343021 - 2³ = 240343013 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 240343021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (240343001) 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, 4500 + ... + 22381.

It is an arithmetic number, because the mean of its divisors is an integer number (60094711).

Almost surely, 2^240343021 is an apocalyptic number.

It is an amenable number.

240343021 is a deficient number, since it is larger than the sum of its proper divisors (35823).

240343021 is an equidigital number, since it uses as much as digits as its factorization.

240343021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35822.

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 240343021 is about 15503.0003870219. Note that the first 3 decimals coincide. The cubic root of 240343021 is about 621.7424285841.

Adding to 240343021 its reverse (120343042), we get a palindrome (360686063).

The spelling of 240343021 in words is "two hundred forty million, three hundred forty-three thousand, twenty-one".