21883688 has 16 divisors (see below), whose sum is σ = 41188500. Its totient is φ = 10900096.

The previous prime is 21883679. The next prime is 21883699. The reversal of 21883688 is 88638812.

It can be written as a sum of positive squares in 2 ways, for example, as 21883684 + 4 = 4678^2 + 2^2 .

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 3 ways as a sum of consecutive naturals, for example, 2933 + ... + 7236.

Almost surely, 2^21883688 is an apocalyptic number.

It is an amenable number.

21883688 is a deficient number, since it is larger than the sum of its proper divisors (19304812).

21883688 is a wasteful number, since it uses less digits than its factorization.

21883688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10444 (or 10440 counting only the distinct ones).

The product of its digits is 147456, while the sum is 44.

The square root of 21883688 is about 4678.0004275331. Note that the first 3 decimals coincide. The cubic root of 21883688 is about 279.7092560274.

The spelling of 21883688 in words is "twenty-one million, eight hundred eighty-three thousand, six hundred eighty-eight".