21601013535 has 96 divisors (see below), whose sum is σ = 40316635008. Its totient is φ = 10659962880.

The previous prime is 21601013519. The next prime is 21601013563. The reversal of 21601013535 is 53531010612.

21601013535 is a `hidden beast` number, since 2 + 1 + 601 + 0 + 1 + 3 + 53 + 5 = 666.

It is not a de Polignac number, because 21601013535 - 2⁴ = 21601013519 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21601013499 and 21601013508.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 34232670 + ... + 34233300.

It is an arithmetic number, because the mean of its divisors is an integer number (419964948).

Almost surely, 2^21601013535 is an apocalyptic number.

21601013535 is a deficient number, since it is larger than the sum of its proper divisors (18715621473).

21601013535 is a wasteful number, since it uses less digits than its factorization.

21601013535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1345 (or 1342 counting only the distinct ones).

The product of its (nonzero) digits is 2700, while the sum is 27.

The spelling of 21601013535 in words is "twenty-one billion, six hundred one million, thirteen thousand, five hundred thirty-five".