21880227 has 4 divisors (see below), whose sum is σ = 29173640. Its totient is φ = 14586816.

The previous prime is 21880171. The next prime is 21880231. The reversal of 21880227 is 72208812.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 21880227 - 2⁷ = 21880099 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21880194 and 21880203.

It is not an unprimeable number, because it can be changed into a prime (21880247) 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, 3646702 + ... + 3646707.

It is an arithmetic number, because the mean of its divisors is an integer number (7293410).

Almost surely, 2^21880227 is an apocalyptic number.

21880227 is a deficient number, since it is larger than the sum of its proper divisors (7293413).

21880227 is an equidigital number, since it uses as much as digits as its factorization.

21880227 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7293412.

The product of its (nonzero) digits is 3584, while the sum is 30.

The square root of 21880227 is about 4677.6304898955. The cubic root of 21880227 is about 279.6945095067.

The spelling of 21880227 in words is "twenty-one million, eight hundred eighty thousand, two hundred twenty-seven".