21184896 has 64 divisors (see below), whose sum is σ = 57625920. Its totient is φ = 6892032.

The previous prime is 21184859. The next prime is 21184903. The reversal of 21184896 is 69848112.

It is a tau number, because it is divible by the number of its divisors (64).

It is a super-3 number, since 3×21184896³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15871 + ... + 17153.

It is an arithmetic number, because the mean of its divisors is an integer number (900405).

Almost surely, 2^21184896 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21184896, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28812960).

21184896 is an abundant number, since it is smaller than the sum of its proper divisors (36441024).

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

21184896 is a wasteful number, since it uses less digits than its factorization.

21184896 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1343 (or 1331 counting only the distinct ones).

The product of its digits is 27648, while the sum is 39.

The square root of 21184896 is about 4602.7052914563. The cubic root of 21184896 is about 276.6997576587.

The spelling of 21184896 in words is "twenty-one million, one hundred eighty-four thousand, eight hundred ninety-six".