240424921 has 4 divisors (see below), whose sum is σ = 262281744. Its totient is φ = 218568100.

The previous prime is 240424913. The next prime is 240424979. The reversal of 240424921 is 129424042.

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 240424921 - 2³ = 240424913 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 240424921.

It is not an unprimeable number, because it can be changed into a prime (240424981) 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, 10928395 + ... + 10928416.

It is an arithmetic number, because the mean of its divisors is an integer number (65570436).

Almost surely, 2^240424921 is an apocalyptic number.

It is an amenable number.

240424921 is a deficient number, since it is larger than the sum of its proper divisors (21856823).

240424921 is a wasteful number, since it uses less digits than its factorization.

240424921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21856822.

The product of its (nonzero) digits is 4608, while the sum is 28.

The square root of 240424921 is about 15505.6415862098. The cubic root of 240424921 is about 621.8130428279.

Adding to 240424921 its reverse (129424042), we get a palindrome (369848963).

The spelling of 240424921 in words is "two hundred forty million, four hundred twenty-four thousand, nine hundred twenty-one".