21827223 has 24 divisors (see below), whose sum is σ = 35133696. Its totient is φ = 12944400.

The previous prime is 21827191. The next prime is 21827233. The reversal of 21827223 is 32272812.

It is a happy number.

It is not a de Polignac number, because 21827223 - 2⁵ = 21827191 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21827233) 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 23 ways as a sum of consecutive naturals, for example, 2308 + ... + 6998.

It is an arithmetic number, because the mean of its divisors is an integer number (1463904).

Almost surely, 2^21827223 is an apocalyptic number.

21827223 is a deficient number, since it is larger than the sum of its proper divisors (13306473).

21827223 is a wasteful number, since it uses less digits than its factorization.

21827223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4755 (or 4752 counting only the distinct ones).

The product of its digits is 2688, while the sum is 27.

The square root of 21827223 is about 4671.9613654224. The cubic root of 21827223 is about 279.4684771952.

The spelling of 21827223 in words is "twenty-one million, eight hundred twenty-seven thousand, two hundred twenty-three".