23824021 has 32 divisors (see below), whose sum is σ = 29272320. Its totient is φ = 19160064.

The previous prime is 23824013. The next prime is 23824033. The reversal of 23824021 is 12042832.

It is a cyclic number.

It is not a de Polignac number, because 23824021 - 2³ = 23824013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 23823983 and 23824001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23824001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 218515 + ... + 218623.

It is an arithmetic number, because the mean of its divisors is an integer number (914760).

Almost surely, 2^23824021 is an apocalyptic number.

It is an amenable number.

23824021 is a deficient number, since it is larger than the sum of its proper divisors (5448299).

23824021 is a wasteful number, since it uses less digits than its factorization.

23824021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205.

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 23824021 is about 4880.9856586554. The cubic root of 23824021 is about 287.7431681828.

Adding to 23824021 its reverse (12042832), we get a palindrome (35866853).

The spelling of 23824021 in words is "twenty-three million, eight hundred twenty-four thousand, twenty-one".