21560536 has 16 divisors (see below), whose sum is σ = 40746240. Its totient is φ = 10694880.

The previous prime is 21560507. The next prime is 21560549. The reversal of 21560536 is 63506512.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9595 + ... + 11626.

It is an arithmetic number, because the mean of its divisors is an integer number (2546640).

Almost surely, 2^21560536 is an apocalyptic number.

It is an amenable number.

21560536 is a deficient number, since it is larger than the sum of its proper divisors (19185704).

21560536 is a wasteful number, since it uses less digits than its factorization.

21560536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21354 (or 21350 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 28.

The square root of 21560536 is about 4643.3324240248. The cubic root of 21560536 is about 278.3256195248.

The spelling of 21560536 in words is "twenty-one million, five hundred sixty thousand, five hundred thirty-six".