23867221 has 4 divisors (see below), whose sum is σ = 27276832. Its totient is φ = 20457612.

The previous prime is 23867197. The next prime is 23867227. The reversal of 23867221 is 12276832.

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 de Polignac number, because none of the positive numbers 2^k-23867221 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 (23867227) 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, 1704795 + ... + 1704808.

It is an arithmetic number, because the mean of its divisors is an integer number (6819208).

Almost surely, 2^23867221 is an apocalyptic number.

It is an amenable number.

23867221 is a deficient number, since it is larger than the sum of its proper divisors (3409611).

23867221 is an equidigital number, since it uses as much as digits as its factorization.

23867221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3409610.

The product of its digits is 8064, while the sum is 31.

The square root of 23867221 is about 4885.4089900437. The cubic root of 23867221 is about 287.9169843357.

The spelling of 23867221 in words is "twenty-three million, eight hundred sixty-seven thousand, two hundred twenty-one".