21823229 has 12 divisors (see below), whose sum is σ = 23637600. Its totient is φ = 20091888.

The previous prime is 21823211. The next prime is 21823247. The reversal of 21823229 is 92232812.

It is an interprime number because it is at equal distance from previous prime (21823211) and next prime (21823247).

It is not a de Polignac number, because 21823229 - 2¹⁶ = 21757693 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21823429) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25592 + ... + 26430.

It is an arithmetic number, because the mean of its divisors is an integer number (1969800).

Almost surely, 2^21823229 is an apocalyptic number.

It is an amenable number.

21823229 is a deficient number, since it is larger than the sum of its proper divisors (1814371).

21823229 is an equidigital number, since it uses as much as digits as its factorization.

21823229 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 932 (or 895 counting only the distinct ones).

The product of its digits is 3456, while the sum is 29.

The square root of 21823229 is about 4671.5339022638. The cubic root of 21823229 is about 279.4514302078.

The spelling of 21823229 in words is "twenty-one million, eight hundred twenty-three thousand, two hundred twenty-nine".