21589845 has 8 divisors (see below), whose sum is σ = 34543776. Its totient is φ = 11514576.

The previous prime is 21589819. The next prime is 21589853. The reversal of 21589845 is 54898512.

It is a happy number.

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

It is not a de Polignac number, because 21589845 - 2⁹ = 21589333 is a prime.

It is a super-2 number, since 2×21589845² = 932242814248050, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21589797 and 21589806.

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, 719647 + ... + 719676.

It is an arithmetic number, because the mean of its divisors is an integer number (4317972).

Almost surely, 2^21589845 is an apocalyptic number.

It is an amenable number.

21589845 is a deficient number, since it is larger than the sum of its proper divisors (12953931).

21589845 is a wasteful number, since it uses less digits than its factorization.

21589845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1439331.

The product of its digits is 115200, while the sum is 42.

The square root of 21589845 is about 4646.4873829593. The cubic root of 21589845 is about 278.4516793471.

The spelling of 21589845 in words is "twenty-one million, five hundred eighty-nine thousand, eight hundred forty-five".