23412821 has 4 divisors (see below), whose sum is σ = 23426592. Its totient is φ = 23399052.

The previous prime is 23412811. The next prime is 23412833. The reversal of 23412821 is 12821432.

It is a happy number.

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 a de Polignac number, because none of the positive numbers 2^k-23412821 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23412811) 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, 3905 + ... + 7878.

It is an arithmetic number, because the mean of its divisors is an integer number (5856648).

Almost surely, 2^23412821 is an apocalyptic number.

It is an amenable number.

23412821 is a deficient number, since it is larger than the sum of its proper divisors (13771).

23412821 is a wasteful number, since it uses less digits than its factorization.

23412821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13770.

The product of its digits is 768, while the sum is 23.

The square root of 23412821 is about 4838.6796752833. The cubic root of 23412821 is about 286.0780794856.

The spelling of 23412821 in words is "twenty-three million, four hundred twelve thousand, eight hundred twenty-one".