21794573 has 8 divisors (see below), whose sum is σ = 22620600. Its totient is φ = 20973568.

The previous prime is 21794557. The next prime is 21794609. The reversal of 21794573 is 37549712.

It can be written as a sum of positive squares in 4 ways, for example, as 1119364 + 20675209 = 1058^2 + 4547^2 .

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 21794573 - 2⁴ = 21794557 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 (21794533) 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, 9173 + ... + 11301.

It is an arithmetic number, because the mean of its divisors is an integer number (2827575).

Almost surely, 2^21794573 is an apocalyptic number.

It is an amenable number.

21794573 is a deficient number, since it is larger than the sum of its proper divisors (826027).

21794573 is a wasteful number, since it uses less digits than its factorization.

21794573 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2511.

The product of its digits is 52920, while the sum is 38.

The square root of 21794573 is about 4668.4658079502. The cubic root of 21794573 is about 279.3290610904.

The spelling of 21794573 in words is "twenty-one million, seven hundred ninety-four thousand, five hundred seventy-three".