21616035546555 has 12 divisors (see below), whose sum is σ = 37467794947440. Its totient is φ = 11528552291472.

The previous prime is 21616035546541. The next prime is 21616035546577. The reversal of 21616035546555 is 55564553061612.

21616035546555 is a `hidden beast` number, since 2 + 1 + 6 + 1 + 6 + 0 + 35 + 54 + 6 + 555 = 666.

It is not a de Polignac number, because 21616035546555 - 2²⁴ = 21616018769339 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 240178172695 + ... + 240178172784.

It is an arithmetic number, because the mean of its divisors is an integer number (3122316245620).

Almost surely, 2^{21616035546555} is an apocalyptic number.

21616035546555 is a deficient number, since it is larger than the sum of its proper divisors (15851759400885).

21616035546555 is a wasteful number, since it uses less digits than its factorization.

21616035546555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 480356345490 (or 480356345487 counting only the distinct ones).

The product of its (nonzero) digits is 16200000, while the sum is 54.

The spelling of 21616035546555 in words is "twenty-one trillion, six hundred sixteen billion, thirty-five million, five hundred forty-six thousand, five hundred fifty-five".