21616402346305 has 16 divisors (see below), whose sum is σ = 28182255811920. Its totient is φ = 15821617287168.

The previous prime is 21616402346303. The next prime is 21616402346323. The reversal of 21616402346305 is 50364320461612.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 7517225963536 + 14099176382769 = 2741756^2 + 3754887^2 .

It is a cyclic number.

It is not a de Polignac number, because 21616402346305 - 2¹ = 21616402346303 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21616402346303) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1471497240 + ... + 1471511929.

It is an arithmetic number, because the mean of its divisors is an integer number (1761390988245).

Almost surely, 2^{21616402346305} is an apocalyptic number.

It is an amenable number.

21616402346305 is a deficient number, since it is larger than the sum of its proper divisors (6565853465615).

21616402346305 is a wasteful number, since it uses less digits than its factorization.

21616402346305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2943009300.

The product of its (nonzero) digits is 622080, while the sum is 43.

The spelling of 21616402346305 in words is "twenty-one trillion, six hundred sixteen billion, four hundred two million, three hundred forty-six thousand, three hundred five".