21282608 has 20 divisors (see below), whose sum is σ = 42242088. Its totient is φ = 10381440.

The previous prime is 21282601. The next prime is 21282629. The reversal of 21282608 is 80628212.

It is a Smith number, since the sum of its digits (29) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (21282601) 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, 15566 + ... + 16877.

Almost surely, 2^21282608 is an apocalyptic number.

It is an amenable number.

21282608 is a deficient number, since it is larger than the sum of its proper divisors (20959480).

21282608 is a wasteful number, since it uses less digits than its factorization.

21282608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32492 (or 32486 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 29.

The square root of 21282608 is about 4613.3077070579. The cubic root of 21282608 is about 277.1245166491.

The spelling of 21282608 in words is "twenty-one million, two hundred eighty-two thousand, six hundred eight".