240534021 has 16 divisors (see below), whose sum is σ = 394722944. Its totient is φ = 126874944.

The previous prime is 240534017. The next prime is 240534029. The reversal of 240534021 is 120435042.

It is not a de Polignac number, because 240534021 - 2² = 240534017 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (240534029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 440266 + ... + 440811.

It is an arithmetic number, because the mean of its divisors is an integer number (24670184).

Almost surely, 2^240534021 is an apocalyptic number.

240534021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

240534021 is a deficient number, since it is larger than the sum of its proper divisors (154188923).

240534021 is a wasteful number, since it uses less digits than its factorization.

240534021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 881100.

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 240534021 is about 15509.1592615461. The cubic root of 240534021 is about 621.9070840277.

Adding to 240534021 its reverse (120435042), we get a palindrome (360969063).

The spelling of 240534021 in words is "two hundred forty million, five hundred thirty-four thousand, twenty-one".