23900821 has 4 divisors (see below), whose sum is σ = 27315232. Its totient is φ = 20486412.

The previous prime is 23900797. The next prime is 23900831. The reversal of 23900821 is 12800932.

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 23900821 - 2¹¹ = 23898773 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23900831) 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 3 ways as a sum of consecutive naturals, for example, 1707195 + ... + 1707208.

It is an arithmetic number, because the mean of its divisors is an integer number (6828808).

Almost surely, 2^23900821 is an apocalyptic number.

It is an amenable number.

23900821 is a deficient number, since it is larger than the sum of its proper divisors (3414411).

23900821 is an equidigital number, since it uses as much as digits as its factorization.

23900821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3414410.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 23900821 is about 4888.8465919887. The cubic root of 23900821 is about 288.0520297266.

The spelling of 23900821 in words is "twenty-three million, nine hundred thousand, eight hundred twenty-one".