21894324 has 24 divisors (see below), whose sum is σ = 51165408. Its totient is φ = 7286880.

The previous prime is 21894293. The next prime is 21894329. The reversal of 21894324 is 42349812.

It is a super-2 number, since 2×21894324² = 958722846833952, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21894329) 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 7 ways as a sum of consecutive naturals, for example, 11359 + ... + 13145.

It is an arithmetic number, because the mean of its divisors is an integer number (2131892).

Almost surely, 2^21894324 is an apocalyptic number.

It is an amenable number.

21894324 is an abundant number, since it is smaller than the sum of its proper divisors (29271084).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21894324 is a wasteful number, since it uses less digits than its factorization.

21894324 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2815 (or 2813 counting only the distinct ones).

The product of its digits is 13824, while the sum is 33.

The square root of 21894324 is about 4679.1370999363. The cubic root of 21894324 is about 279.7545638355.

The spelling of 21894324 in words is "twenty-one million, eight hundred ninety-four thousand, three hundred twenty-four".