21560873616 has 60 divisors (see below), whose sum is σ = 60351287568. Its totient is φ = 7185673152.

The previous prime is 21560873591. The next prime is 21560873617. The reversal of 21560873616 is 61637806512.

21560873616 is a `hidden beast` number, since 2 + 1 + 5 + 608 + 7 + 36 + 1 + 6 = 666.

It is not an unprimeable number, because it can be changed into a prime (21560873617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1137271 + ... + 1156073.

Almost surely, 2^21560873616 is an apocalyptic number.

It is an amenable number.

21560873616 is an abundant number, since it is smaller than the sum of its proper divisors (38790413952).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21560873616 is a wasteful number, since it uses less digits than its factorization.

21560873616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26780 (or 26771 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 45.

The spelling of 21560873616 in words is "twenty-one billion, five hundred sixty million, eight hundred seventy-three thousand, six hundred sixteen".