21703268 has 24 divisors (see below), whose sum is σ = 39584160. Its totient is φ = 10402880.

The previous prime is 21703247. The next prime is 21703277. The reversal of 21703268 is 86230712.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21703268.

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, 8555 + ... + 10797.

It is an arithmetic number, because the mean of its divisors is an integer number (1649340).

Almost surely, 2^21703268 is an apocalyptic number.

It is an amenable number.

21703268 is a deficient number, since it is larger than the sum of its proper divisors (17880892).

21703268 is a wasteful number, since it uses less digits than its factorization.

21703268 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2347 (or 2345 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 21703268 is about 4658.6766361275. The cubic root of 21703268 is about 278.9384464441.

The spelling of 21703268 in words is "twenty-one million, seven hundred three thousand, two hundred sixty-eight".