23085821 has 4 divisors (see below), whose sum is σ = 25184544. Its totient is φ = 20987100.

The previous prime is 23085781. The next prime is 23085823. The reversal of 23085821 is 12858032.

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-23085821 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23085823) 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, 1049345 + ... + 1049366.

It is an arithmetic number, because the mean of its divisors is an integer number (6296136).

Almost surely, 2^23085821 is an apocalyptic number.

It is an amenable number.

23085821 is a deficient number, since it is larger than the sum of its proper divisors (2098723).

23085821 is a wasteful number, since it uses less digits than its factorization.

23085821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2098722.

The product of its (nonzero) digits is 3840, while the sum is 29.

The square root of 23085821 is about 4804.7706500935. The cubic root of 23085821 is about 284.7399741791.

The spelling of 23085821 in words is "twenty-three million, eighty-five thousand, eight hundred twenty-one".