21792853 has 8 divisors (see below), whose sum is σ = 22392216. Its totient is φ = 21196800.

The previous prime is 21792851. The next prime is 21792857. The reversal of 21792853 is 35829712.

It can be written as a sum of positive squares in 4 ways, for example, as 651249 + 21141604 = 807^2 + 4598^2 .

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 21792853 - 2¹ = 21792851 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21792851) 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, 18325 + ... + 19477.

It is an arithmetic number, because the mean of its divisors is an integer number (2799027).

Almost surely, 2^21792853 is an apocalyptic number.

It is an amenable number.

21792853 is a deficient number, since it is larger than the sum of its proper divisors (599363).

21792853 is a wasteful number, since it uses less digits than its factorization.

21792853 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1655.

The product of its digits is 30240, while the sum is 37.

The square root of 21792853 is about 4668.2815896216. The cubic root of 21792853 is about 279.3217127989.

The spelling of 21792853 in words is "twenty-one million, seven hundred ninety-two thousand, eight hundred fifty-three".