21792223 has 8 divisors (see below), whose sum is σ = 22450400. Its totient is φ = 21137760.

The previous prime is 21792203. The next prime is 21792233. The reversal of 21792223 is 32229712.

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

It is a cyclic number.

It is not a de Polignac number, because 21792223 - 2⁵ = 21792191 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21792191 and 21792200.

It is a congruent number.

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, 14878 + ... + 16276.

It is an arithmetic number, because the mean of its divisors is an integer number (2806300).

Almost surely, 2^21792223 is an apocalyptic number.

21792223 is a deficient number, since it is larger than the sum of its proper divisors (658177).

21792223 is a wasteful number, since it uses less digits than its factorization.

21792223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1857.

The product of its digits is 3024, while the sum is 28.

The square root of 21792223 is about 4668.2141124846. The cubic root of 21792223 is about 279.3190211768.

The spelling of 21792223 in words is "twenty-one million, seven hundred ninety-two thousand, two hundred twenty-three".