21470585 has 8 divisors (see below), whose sum is σ = 26653320. Its totient is φ = 16584064.

The previous prime is 21470567. The next prime is 21470591. The reversal of 21470585 is 58507412.

It can be written as a sum of positive squares in 4 ways, for example, as 135424 + 21335161 = 368^2 + 4619^2 .

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 21470585 - 2⁶ = 21470521 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 73892 + ... + 74181.

It is an arithmetic number, because the mean of its divisors is an integer number (3331665).

Almost surely, 2^21470585 is an apocalyptic number.

It is an amenable number.

21470585 is a deficient number, since it is larger than the sum of its proper divisors (5182735).

21470585 is a wasteful number, since it uses less digits than its factorization.

21470585 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148107.

The product of its (nonzero) digits is 11200, while the sum is 32.

The square root of 21470585 is about 4633.6362610805. The cubic root of 21470585 is about 277.9380199282.

Adding to 21470585 its reverse (58507412), we get a palindrome (79977997).

The spelling of 21470585 in words is "twenty-one million, four hundred seventy thousand, five hundred eighty-five".