21589473 has 8 divisors (see below), whose sum is σ = 30479328. Its totient is φ = 13546304.

The previous prime is 21589471. The next prime is 21589481. The reversal of 21589473 is 37498512.

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 21589473 - 2¹ = 21589471 is a prime.

It is a super-2 number, since 2×21589473² = 932210688835458, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21589471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 211611 + ... + 211712.

It is an arithmetic number, because the mean of its divisors is an integer number (3809916).

Almost surely, 2^21589473 is an apocalyptic number.

It is an amenable number.

21589473 is a deficient number, since it is larger than the sum of its proper divisors (8889855).

21589473 is a wasteful number, since it uses less digits than its factorization.

21589473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 423343.

The product of its digits is 60480, while the sum is 39.

The square root of 21589473 is about 4646.4473525480. The cubic root of 21589473 is about 278.4500800671.

The spelling of 21589473 in words is "twenty-one million, five hundred eighty-nine thousand, four hundred seventy-three".