21282908 has 6 divisors (see below), whose sum is σ = 37245096. Its totient is φ = 10641452.

The previous prime is 21282901. The next prime is 21282923. The reversal of 21282908 is 80928212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21282901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2660360 + ... + 2660367.

It is an arithmetic number, because the mean of its divisors is an integer number (6207516).

Almost surely, 2^21282908 is an apocalyptic number.

It is an amenable number.

21282908 is a deficient number, since it is larger than the sum of its proper divisors (15962188).

21282908 is a wasteful number, since it uses less digits than its factorization.

21282908 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5320731 (or 5320729 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 21282908 is about 4613.3402215748. The cubic root of 21282908 is about 277.1258187603.

The spelling of 21282908 in words is "twenty-one million, two hundred eighty-two thousand, nine hundred eight".