23380821 has 6 divisors (see below), whose sum is σ = 33772310. Its totient is φ = 15587208.

The previous prime is 23380807. The next prime is 23380823. The reversal of 23380821 is 12808332.

It can be written as a sum of positive squares in only one way, i.e., 18584721 + 4796100 = 4311^2 + 2190^2 .

It is not a de Polignac number, because 23380821 - 2⁹ = 23380309 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23380823) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1298926 + ... + 1298943.

Almost surely, 2^23380821 is an apocalyptic number.

It is an amenable number.

23380821 is a deficient number, since it is larger than the sum of its proper divisors (10391489).

23380821 is a wasteful number, since it uses less digits than its factorization.

23380821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2597875 (or 2597872 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 23380821 is about 4835.3718574687. The cubic root of 23380821 is about 285.9476855101.

The spelling of 23380821 in words is "twenty-three million, three hundred eighty thousand, eight hundred twenty-one".