21560944 has 20 divisors (see below), whose sum is σ = 41856696. Its totient is φ = 10759232.

The previous prime is 21560941. The next prime is 21560969. The reversal of 21560944 is 44906512.

It is a super-2 number, since 2×21560944² = 929748612342272, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21560941) by changing a digit.

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, 9942 + ... + 11914.

Almost surely, 2^21560944 is an apocalyptic number.

It is an amenable number.

21560944 is a deficient number, since it is larger than the sum of its proper divisors (20295752).

21560944 is a wasteful number, since it uses less digits than its factorization.

21560944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2664 (or 2658 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 21560944 is about 4643.3763577810. The cubic root of 21560944 is about 278.3273751419.

The spelling of 21560944 in words is "twenty-one million, five hundred sixty thousand, nine hundred forty-four".