21865227 has 8 divisors (see below), whose sum is σ = 29302416. Its totient is φ = 14502432.

The previous prime is 21865211. The next prime is 21865229. The reversal of 21865227 is 72256812.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21865227 - 2⁴ = 21865211 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21865229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17908 + ... + 19089.

It is an arithmetic number, because the mean of its divisors is an integer number (3662802).

Almost surely, 2^21865227 is an apocalyptic number.

21865227 is a deficient number, since it is larger than the sum of its proper divisors (7437189).

21865227 is a wasteful number, since it uses less digits than its factorization.

21865227 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37197.

The product of its digits is 13440, while the sum is 33.

The square root of 21865227 is about 4676.0268391018. The cubic root of 21865227 is about 279.6305799943.

The spelling of 21865227 in words is "twenty-one million, eight hundred sixty-five thousand, two hundred twenty-seven".