21496384 has 56 divisors (see below), whose sum is σ = 52515008. Its totient is φ = 8501760.

The previous prime is 21496373. The next prime is 21496399. The reversal of 21496384 is 48369412.

It is a tau number, because it is divible by the number of its divisors (56).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3979 + ... + 7669.

It is an arithmetic number, because the mean of its divisors is an integer number (937768).

Almost surely, 2^21496384 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 21496384, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26257504).

21496384 is an abundant number, since it is smaller than the sum of its proper divisors (31018624).

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

21496384 is a wasteful number, since it uses less digits than its factorization.

21496384 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3723 (or 3713 counting only the distinct ones).

The product of its digits is 41472, while the sum is 37.

The square root of 21496384 is about 4636.4193080437. The cubic root of 21496384 is about 278.0492985740.

The spelling of 21496384 in words is "twenty-one million, four hundred ninety-six thousand, three hundred eighty-four".