21585484 has 12 divisors (see below), whose sum is σ = 38653384. Its totient is φ = 10541664.

The previous prime is 21585439. The next prime is 21585493. The reversal of 21585484 is 48458512.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62577 + ... + 62920.

Almost surely, 2^21585484 is an apocalyptic number.

It is an amenable number.

21585484 is a deficient number, since it is larger than the sum of its proper divisors (17067900).

21585484 is a wasteful number, since it uses less digits than its factorization.

21585484 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125544 (or 125542 counting only the distinct ones).

The product of its digits is 51200, while the sum is 37.

The square root of 21585484 is about 4646.0180800337. The cubic root of 21585484 is about 278.4329296441.

The spelling of 21585484 in words is "twenty-one million, five hundred eighty-five thousand, four hundred eighty-four".