23804021 has 4 divisors (see below), whose sum is σ = 24035232. Its totient is φ = 23572812.

The previous prime is 23804009. The next prime is 23804023. The reversal of 23804021 is 12040832.

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 23804021 - 2¹⁴ = 23787637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 23803984 and 23804002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23804023) 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, 115451 + ... + 115656.

It is an arithmetic number, because the mean of its divisors is an integer number (6008808).

Almost surely, 2^23804021 is an apocalyptic number.

It is an amenable number.

23804021 is a deficient number, since it is larger than the sum of its proper divisors (231211).

23804021 is a wasteful number, since it uses less digits than its factorization.

23804021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 231210.

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 23804021 is about 4878.9364619761. The cubic root of 23804021 is about 287.6626265802.

Adding to 23804021 its reverse (12040832), we get a palindrome (35844853).

The spelling of 23804021 in words is "twenty-three million, eight hundred four thousand, twenty-one".