21796384 has 12 divisors (see below), whose sum is σ = 42911694. Its totient is φ = 10898176.

The previous prime is 21796351. The next prime is 21796393. The reversal of 21796384 is 48369712.

It can be written as a sum of positive squares in only one way, i.e., 17875984 + 3920400 = 4228^2 + 1980^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340537 + ... + 340600.

Almost surely, 2^21796384 is an apocalyptic number.

It is an amenable number.

21796384 is a deficient number, since it is larger than the sum of its proper divisors (21115310).

21796384 is an equidigital number, since it uses as much as digits as its factorization.

21796384 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 681147 (or 681139 counting only the distinct ones).

The product of its digits is 72576, while the sum is 40.

The square root of 21796384 is about 4668.6597648576. The cubic root of 21796384 is about 279.3367977399.

The spelling of 21796384 in words is "twenty-one million, seven hundred ninety-six thousand, three hundred eighty-four".