21445589 has 8 divisors (see below), whose sum is σ = 23453760. Its totient is φ = 19447200.

The previous prime is 21445579. The next prime is 21445597. The reversal of 21445589 is 98554412.

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 21445589 - 2⁴ = 21445573 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21445579) 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, 2609 + ... + 7049.

It is an arithmetic number, because the mean of its divisors is an integer number (2931720).

Almost surely, 2^21445589 is an apocalyptic number.

It is an amenable number.

21445589 is a deficient number, since it is larger than the sum of its proper divisors (2008171).

21445589 is a wasteful number, since it uses less digits than its factorization.

21445589 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4891.

The product of its digits is 57600, while the sum is 38.

The square root of 21445589 is about 4630.9382418685. The cubic root of 21445589 is about 277.8301198017.

The spelling of 21445589 in words is "twenty-one million, four hundred forty-five thousand, five hundred eighty-nine".