21073268 has 24 divisors (see below), whose sum is σ = 39961152. Its totient is φ = 9684864.

The previous prime is 21073259. The next prime is 21073271. The reversal of 21073268 is 86237012.

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 21073268.

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, 680 + ... + 6527.

It is an arithmetic number, because the mean of its divisors is an integer number (1665048).

Almost surely, 2^21073268 is an apocalyptic number.

It is an amenable number.

21073268 is a deficient number, since it is larger than the sum of its proper divisors (18887884).

21073268 is a wasteful number, since it uses less digits than its factorization.

21073268 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7271 (or 7269 counting only the distinct ones).

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

The square root of 21073268 is about 4590.5629284435. The cubic root of 21073268 is about 276.2129037088.

The spelling of 21073268 in words is "twenty-one million, seventy-three thousand, two hundred sixty-eight".