21884233 has 12 divisors (see below), whose sum is σ = 26280192. Its totient is φ = 18151560.

The previous prime is 21884227. The next prime is 21884263. The reversal of 21884233 is 33248812.

It is not a de Polignac number, because 21884233 - 2²¹ = 19787081 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21884195 and 21884204.

It is not an unprimeable number, because it can be changed into a prime (21884263) 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, 5685 + ... + 8722.

It is an arithmetic number, because the mean of its divisors is an integer number (2190016).

Almost surely, 2^21884233 is an apocalyptic number.

It is an amenable number.

21884233 is a deficient number, since it is larger than the sum of its proper divisors (4395959).

21884233 is a wasteful number, since it uses less digits than its factorization.

21884233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14452 (or 14445 counting only the distinct ones).

The product of its digits is 9216, while the sum is 31.

The square root of 21884233 is about 4678.0586785546. The cubic root of 21884233 is about 279.7115780047.

The spelling of 21884233 in words is "twenty-one million, eight hundred eighty-four thousand, two hundred thirty-three".