21792273 has 8 divisors (see below), whose sum is σ = 29383200. Its totient is φ = 14364768.

The previous prime is 21792263. The next prime is 21792289. The reversal of 21792273 is 37229712.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21792273 - 2⁵ = 21792241 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21792203) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40543 + ... + 41076.

It is an arithmetic number, because the mean of its divisors is an integer number (3672900).

Almost surely, 2^21792273 is an apocalyptic number.

It is an amenable number.

21792273 is a deficient number, since it is larger than the sum of its proper divisors (7590927).

21792273 is an equidigital number, since it uses as much as digits as its factorization.

21792273 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81711.

The product of its digits is 10584, while the sum is 33.

The square root of 21792273 is about 4668.2194678485. The cubic root of 21792273 is about 279.3192347995.

The spelling of 21792273 in words is "twenty-one million, seven hundred ninety-two thousand, two hundred seventy-three".