21584005 has 8 divisors (see below), whose sum is σ = 27027072. Its totient is φ = 16516368.

The previous prime is 21583997. The next prime is 21584027. The reversal of 21584005 is 50048512.

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 21584005 - 2³ = 21583997 is a prime.

It is a Duffinian number.

It is a congruent number.

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, 93729 + ... + 93958.

It is an arithmetic number, because the mean of its divisors is an integer number (3378384).

Almost surely, 2^21584005 is an apocalyptic number.

It is an amenable number.

21584005 is a deficient number, since it is larger than the sum of its proper divisors (5443067).

21584005 is a wasteful number, since it uses less digits than its factorization.

21584005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187715.

The product of its (nonzero) digits is 1600, while the sum is 25.

The square root of 21584005 is about 4645.8589087487. The cubic root of 21584005 is about 278.4265702514.

The spelling of 21584005 in words is "twenty-one million, five hundred eighty-four thousand, five".