21140584 has 16 divisors (see below), whose sum is σ = 40606020. Its totient is φ = 10312320.

The previous prime is 21140569. The next prime is 21140599. The reversal of 21140584 is 48504112.

It is an interprime number because it is at equal distance from previous prime (21140569) and next prime (21140599).

It can be written as a sum of positive squares in 2 ways, for example, as 13176900 + 7963684 = 3630^2 + 2822^2 .

It is a super-2 number, since 2×21140584² = 893848583722112, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31899 + ... + 32554.

Almost surely, 2^21140584 is an apocalyptic number.

It is an amenable number.

21140584 is a deficient number, since it is larger than the sum of its proper divisors (19465436).

21140584 is a wasteful number, since it uses less digits than its factorization.

21140584 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64500 (or 64496 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 25.

The square root of 21140584 is about 4597.8890808718. The cubic root of 21140584 is about 276.5067006432.

Adding to 21140584 its reverse (48504112), we get a palindrome (69644696).

The spelling of 21140584 in words is "twenty-one million, one hundred forty thousand, five hundred eighty-four".