21884799 has 8 divisors (see below), whose sum is σ = 30448512. Its totient is φ = 13955480.

The previous prime is 21884783. The next prime is 21884809. The reversal of 21884799 is 99748812.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21884799 - 2⁴ = 21884783 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21884749) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 158517 + ... + 158654.

It is an arithmetic number, because the mean of its divisors is an integer number (3806064).

Almost surely, 2^21884799 is an apocalyptic number.

21884799 is a deficient number, since it is larger than the sum of its proper divisors (8563713).

21884799 is a wasteful number, since it uses less digits than its factorization.

21884799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 317197.

The product of its digits is 290304, while the sum is 48.

The square root of 21884799 is about 4678.1191733431. The cubic root of 21884799 is about 279.7139894119.

The spelling of 21884799 in words is "twenty-one million, eight hundred eighty-four thousand, seven hundred ninety-nine".