21560106121056 has 96 divisors (see below), whose sum is σ = 66193308316800. Its totient is φ = 6808454559360.

The previous prime is 21560106121033. The next prime is 21560106121063. The reversal of 21560106121056 is 65012160106512.

21560106121056 is a `hidden beast` number, since 2 + 1 + 560 + 10 + 61 + 21 + 0 + 5 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (96).

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 21560106121056.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 656663230 + ... + 656696061.

It is an arithmetic number, because the mean of its divisors is an integer number (689513628300).

Almost surely, 2^{21560106121056} is an apocalyptic number.

It is an amenable number.

21560106121056 is an abundant number, since it is smaller than the sum of its proper divisors (44633202195744).

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

21560106121056 is a wasteful number, since it uses less digits than its factorization.

21560106121056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1313359329 (or 1313359315 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 36.

Adding to 21560106121056 its reverse (65012160106512), we get a palindrome (86572266227568).

The spelling of 21560106121056 in words is "twenty-one trillion, five hundred sixty billion, one hundred six million, one hundred twenty-one thousand, fifty-six".