21883684 has 9 divisors (see below), whose sum is σ = 38312827. Its totient is φ = 10937164.

The previous prime is 21883679. The next prime is 21883699. The reversal of 21883684 is 48638812.

The square root of 21883684 is 4678.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 8187 + ... + 10525.

Almost surely, 2^21883684 is an apocalyptic number.

21883684 is the 4678-th square number.

It is an amenable number.

21883684 is a deficient number, since it is larger than the sum of its proper divisors (16429143).

21883684 is an frugal number, since it uses more digits than its factorization.

21883684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4682 (or 2341 counting only the distinct ones).

The product of its digits is 73728, while the sum is 40.

The cubic root of 21883684 is about 279.7092389852.

The spelling of 21883684 in words is "twenty-one million, eight hundred eighty-three thousand, six hundred eighty-four".