21924889 has 16 divisors (see below), whose sum is σ = 25878528. Its totient is φ = 18186192.

The previous prime is 21924869. The next prime is 21924901. The reversal of 21924889 is 98842912.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21924889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21924829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33564 + ... + 34210.

It is an arithmetic number, because the mean of its divisors is an integer number (1617408).

Almost surely, 2^21924889 is an apocalyptic number.

It is an amenable number.

21924889 is a deficient number, since it is larger than the sum of its proper divisors (3953639).

21924889 is a wasteful number, since it uses less digits than its factorization.

21924889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 804.

The product of its digits is 82944, while the sum is 43.

The square root of 21924889 is about 4682.4020545015. The cubic root of 21924889 is about 279.8846846578.

The spelling of 21924889 in words is "twenty-one million, nine hundred twenty-four thousand, eight hundred eighty-nine".