21508882 has 8 divisors (see below), whose sum is σ = 32717952. Its totient is φ = 10602900.

The previous prime is 21508867. The next prime is 21508889. The reversal of 21508882 is 28880512.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (21508889) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 75594 + ... + 75877.

It is an arithmetic number, because the mean of its divisors is an integer number (4089744).

Almost surely, 2^21508882 is an apocalyptic number.

21508882 is a deficient number, since it is larger than the sum of its proper divisors (11209070).

21508882 is a wasteful number, since it uses less digits than its factorization.

21508882 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151544.

The product of its (nonzero) digits is 10240, while the sum is 34.

The square root of 21508882 is about 4637.7669195422. The cubic root of 21508882 is about 278.1031740984.

The spelling of 21508882 in words is "twenty-one million, five hundred eight thousand, eight hundred eighty-two".