21675489 has 8 divisors (see below), whose sum is σ = 31528032. Its totient is φ = 13136640.

The previous prime is 21675473. The next prime is 21675491. The reversal of 21675489 is 98457612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21675489 - 2⁴ = 21675473 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21675489.

It is not an unprimeable number, because it can be changed into a prime (21675419) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 328384 + ... + 328449.

It is an arithmetic number, because the mean of its divisors is an integer number (3941004).

Almost surely, 2^21675489 is an apocalyptic number.

It is an amenable number.

21675489 is a deficient number, since it is larger than the sum of its proper divisors (9852543).

21675489 is a wasteful number, since it uses less digits than its factorization.

21675489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 656847.

The product of its digits is 120960, while the sum is 42.

The square root of 21675489 is about 4655.6942554253. The cubic root of 21675489 is about 278.8193869643.

The spelling of 21675489 in words is "twenty-one million, six hundred seventy-five thousand, four hundred eighty-nine".