21450589 has 6 divisors (see below), whose sum is σ = 21839066. Its totient is φ = 21063360.

The previous prime is 21450581. The next prime is 21450613. The reversal of 21450589 is 98505412.

It can be written as a sum of positive squares in 3 ways, for example, as 902500 + 20548089 = 950^2 + 4533^2 .

It is not a de Polignac number, because 21450589 - 2³ = 21450581 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21450581) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 35877 + ... + 36469.

Almost surely, 2^21450589 is an apocalyptic number.

It is an amenable number.

21450589 is a deficient number, since it is larger than the sum of its proper divisors (388477).

21450589 is an frugal number, since it uses more digits than its factorization.

21450589 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1247 (or 654 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 34.

The square root of 21450589 is about 4631.4780578126. The cubic root of 21450589 is about 277.8517099859.

The spelling of 21450589 in words is "twenty-one million, four hundred fifty thousand, five hundred eighty-nine".