21869508 has 24 divisors (see below), whose sum is σ = 52675840. Its totient is φ = 7054560.

The previous prime is 21869483. The next prime is 21869521. The reversal of 21869508 is 80596812.

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 7 ways as a sum of consecutive naturals, for example, 29023 + ... + 29766.

Almost surely, 2^21869508 is an apocalyptic number.

It is an amenable number.

21869508 is an abundant number, since it is smaller than the sum of its proper divisors (30806332).

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

21869508 is a wasteful number, since it uses less digits than its factorization.

21869508 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58827 (or 58825 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 39.

The square root of 21869508 is about 4676.4845771156. The cubic root of 21869508 is about 279.6488284579.

The spelling of 21869508 in words is "twenty-one million, eight hundred sixty-nine thousand, five hundred eight".