21616206562045 has 32 divisors (see below), whose sum is σ = 27104268522240. Its totient is φ = 16518480253440.

The previous prime is 21616206562039. The next prime is 21616206562073. The reversal of 21616206562045 is 54026560261612.

It is not a de Polignac number, because 21616206562045 - 2⁹ = 21616206561533 is a prime.

It is a super-2 number, since 2×21616206562045² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21616206561986 and 21616206562004.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1345371102 + ... + 1345387168.

It is an arithmetic number, because the mean of its divisors is an integer number (847008391320).

Almost surely, 2^{21616206562045} is an apocalyptic number.

It is an amenable number.

21616206562045 is a deficient number, since it is larger than the sum of its proper divisors (5488061960195).

21616206562045 is a wasteful number, since it uses less digits than its factorization.

21616206562045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31365.

The product of its (nonzero) digits is 1036800, while the sum is 46.

The spelling of 21616206562045 in words is "twenty-one trillion, six hundred sixteen billion, two hundred six million, five hundred sixty-two thousand, forty-five".