21068273 has 4 divisors (see below), whose sum is σ = 21335040. Its totient is φ = 20801508.

The previous prime is 21068263. The next prime is 21068291. The reversal of 21068273 is 37286012.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21068273 - 2⁶ = 21068209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21068213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 133265 + ... + 133422.

It is an arithmetic number, because the mean of its divisors is an integer number (5333760).

Almost surely, 2^21068273 is an apocalyptic number.

It is an amenable number.

21068273 is a deficient number, since it is larger than the sum of its proper divisors (266767).

21068273 is an equidigital number, since it uses as much as digits as its factorization.

21068273 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266766.

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

The square root of 21068273 is about 4590.0188452772. The cubic root of 21068273 is about 276.1910783885.

The spelling of 21068273 in words is "twenty-one million, sixty-eight thousand, two hundred seventy-three".