21270908 has 24 divisors (see below), whose sum is σ = 38196480. Its totient is φ = 10361520.

The previous prime is 21270881. The next prime is 21270919. The reversal of 21270908 is 80907212.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25823 + ... + 26633.

It is an arithmetic number, because the mean of its divisors is an integer number (1591520).

Almost surely, 2^21270908 is an apocalyptic number.

It is an amenable number.

21270908 is a deficient number, since it is larger than the sum of its proper divisors (16925572).

21270908 is a wasteful number, since it uses less digits than its factorization.

21270908 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 977 (or 975 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 21270908 is about 4612.0394621035. The cubic root of 21270908 is about 277.0737247665.

The spelling of 21270908 in words is "twenty-one million, two hundred seventy thousand, nine hundred eight".