21648108 has 24 divisors (see below), whose sum is σ = 51878512. Its totient is φ = 7020864.

The previous prime is 21648079. The next prime is 21648127. The reversal of 21648108 is 80184612.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23935 + ... + 24822.

Almost surely, 2^21648108 is an apocalyptic number.

It is an amenable number.

21648108 is an abundant number, since it is smaller than the sum of its proper divisors (30230404).

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

21648108 is a wasteful number, since it uses less digits than its factorization.

21648108 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48801 (or 48799 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 30.

The square root of 21648108 is about 4652.7527335976. The cubic root of 21648108 is about 278.7019337044.

The spelling of 21648108 in words is "twenty-one million, six hundred forty-eight thousand, one hundred eight".