21560026161 has 32 divisors (see below), whose sum is σ = 32057510400. Its totient is φ = 12808730880.

The previous prime is 21560026153. The next prime is 21560026171. The reversal of 21560026161 is 16162006512.

It is not a de Polignac number, because 21560026161 - 2³ = 21560026153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21560026171) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2106346 + ... + 2116556.

It is an arithmetic number, because the mean of its divisors is an integer number (1001797200).

Almost surely, 2^21560026161 is an apocalyptic number.

It is an amenable number.

21560026161 is a deficient number, since it is larger than the sum of its proper divisors (10497484239).

21560026161 is a wasteful number, since it uses less digits than its factorization.

21560026161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12429.

The product of its (nonzero) digits is 4320, while the sum is 30.

The spelling of 21560026161 in words is "twenty-one billion, five hundred sixty million, twenty-six thousand, one hundred sixty-one".