21073585 has 8 divisors (see below), whose sum is σ = 27233640. Its totient is φ = 15561984.

The previous prime is 21073579. The next prime is 21073627. The reversal of 21073585 is 58537012.

It can be written as a sum of positive squares in 4 ways, for example, as 2307361 + 18766224 = 1519^2 + 4332^2 .

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 21073585 - 2⁵ = 21073553 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 162040 + ... + 162169.

It is an arithmetic number, because the mean of its divisors is an integer number (3404205).

Almost surely, 2^21073585 is an apocalyptic number.

It is an amenable number.

21073585 is a deficient number, since it is larger than the sum of its proper divisors (6160055).

21073585 is a wasteful number, since it uses less digits than its factorization.

21073585 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 324227.

The product of its (nonzero) digits is 8400, while the sum is 31.

The square root of 21073585 is about 4590.5974556696. The cubic root of 21073585 is about 276.2142887029.

The spelling of 21073585 in words is "twenty-one million, seventy-three thousand, five hundred eighty-five".