232440021 has 24 divisors (see below), whose sum is σ = 367408704. Its totient is φ = 140434560.

The previous prime is 232440011. The next prime is 232440049. The reversal of 232440021 is 120044232.

It is not a de Polignac number, because 232440021 - 2⁹ = 232439509 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 232439976 and 232440003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (232440011) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 29880 + ... + 36846.

It is an arithmetic number, because the mean of its divisors is an integer number (15308696).

Almost surely, 2^232440021 is an apocalyptic number.

It is an amenable number.

232440021 is a deficient number, since it is larger than the sum of its proper divisors (134968683).

232440021 is a wasteful number, since it uses less digits than its factorization.

232440021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7321 (or 7318 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 232440021 is about 15245.9837662251. The cubic root of 232440021 is about 614.8515921893.

Adding to 232440021 its reverse (120044232), we get a palindrome (352484253).

The spelling of 232440021 in words is "two hundred thirty-two million, four hundred forty thousand, twenty-one".