21814233 has 16 divisors (see below), whose sum is σ = 33586560. Its totient is φ = 12335616.

The previous prime is 21814231. The next prime is 21814237. The reversal of 21814233 is 33241812.

It is not a de Polignac number, because 21814233 - 2¹ = 21814231 is a prime.

It is a super-2 number, since 2×21814233² = 951721522756578, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21814231) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3318 + ... + 7391.

It is an arithmetic number, because the mean of its divisors is an integer number (2099160).

Almost surely, 2^21814233 is an apocalyptic number.

It is an amenable number.

21814233 is a deficient number, since it is larger than the sum of its proper divisors (11772327).

21814233 is a wasteful number, since it uses less digits than its factorization.

21814233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10816.

The product of its digits is 1152, while the sum is 24.

The square root of 21814233 is about 4670.5709501088. The cubic root of 21814233 is about 279.4130263190.

The spelling of 21814233 in words is "twenty-one million, eight hundred fourteen thousand, two hundred thirty-three".