21616206042116 has 36 divisors (see below), whose sum is σ = 44004710086848. Its totient is φ = 9264027115728.

The previous prime is 21616206042059. The next prime is 21616206042143. The reversal of 21616206042116 is 61124060261612.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21616206042116.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 41817065 + ... + 42330831.

It is an arithmetic number, because the mean of its divisors is an integer number (1222353057968).

Almost surely, 2^{21616206042116} is an apocalyptic number.

It is an amenable number.

21616206042116 is an abundant number, since it is smaller than the sum of its proper divisors (22388504044732).

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

21616206042116 is a wasteful number, since it uses less digits than its factorization.

21616206042116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 728448 (or 728439 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 38.

The spelling of 21616206042116 in words is "twenty-one trillion, six hundred sixteen billion, two hundred six million, forty-two thousand, one hundred sixteen".