21634896 has 20 divisors (see below), whose sum is σ = 55890272. Its totient is φ = 7211616.

The previous prime is 21634871. The next prime is 21634909. The reversal of 21634896 is 69843612.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 225316 + ... + 225411.

Almost surely, 2^21634896 is an apocalyptic number.

It is an amenable number.

21634896 is an abundant number, since it is smaller than the sum of its proper divisors (34255376).

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

21634896 is a wasteful number, since it uses less digits than its factorization.

21634896 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 450738 (or 450732 counting only the distinct ones).

The product of its digits is 62208, while the sum is 39.

The square root of 21634896 is about 4651.3327122450. The cubic root of 21634896 is about 278.6452242175.

The spelling of 21634896 in words is "twenty-one million, six hundred thirty-four thousand, eight hundred ninety-six".