13021345656 has 96 divisors (see below), whose sum is σ = 39366961920. Its totient is φ = 3854088000.

The previous prime is 13021345643. The next prime is 13021345661. The reversal of 13021345656 is 65654312031.

13021345656 is a `hidden beast` number, since 1 + 302 + 1 + 345 + 6 + 5 + 6 = 666.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 13021345656.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 157120 + ... + 225231.

It is an arithmetic number, because the mean of its divisors is an integer number (410072520).

Almost surely, 2^13021345656 is an apocalyptic number.

It is an amenable number.

13021345656 is an abundant number, since it is smaller than the sum of its proper divisors (26345616264).

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

13021345656 is a wasteful number, since it uses less digits than its factorization.

13021345656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 382417 (or 382410 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 36.

Adding to 13021345656 its reverse (65654312031), we get a palindrome (78675657687).

The spelling of 13021345656 in words is "thirteen billion, twenty-one million, three hundred forty-five thousand, six hundred fifty-six".