21560039 has 8 divisors (see below), whose sum is σ = 22807392. Its totient is φ = 20338560.

The previous prime is 21560027. The next prime is 21560047. The reversal of 21560039 is 93006512.

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 21560039 - 2²⁴ = 4782823 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21560009) 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, 4742 + ... + 8099.

It is an arithmetic number, because the mean of its divisors is an integer number (2850924).

Almost surely, 2^21560039 is an apocalyptic number.

21560039 is a deficient number, since it is larger than the sum of its proper divisors (1247353).

21560039 is a wasteful number, since it uses less digits than its factorization.

21560039 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12937.

The product of its (nonzero) digits is 1620, while the sum is 26.

The square root of 21560039 is about 4643.2789061180. The cubic root of 21560039 is about 278.3234809123.

The spelling of 21560039 in words is "twenty-one million, five hundred sixty thousand, thirty-nine".