21161014512345 has 80 divisors (see below), whose sum is σ = 38054296526400. Its totient is φ = 11249830800000.

The previous prime is 21161014512343. The next prime is 21161014512373. The reversal of 21161014512345 is 54321541016112.

21161014512345 is a `hidden beast` number, since 2 + 1 + 1 + 6 + 101 + 4 + 512 + 34 + 5 = 666.

It is not a de Polignac number, because 21161014512345 - 2¹ = 21161014512343 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21161014512343) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 459489570 + ... + 459535620.

It is an arithmetic number, because the mean of its divisors is an integer number (475678706580).

Almost surely, 2^{21161014512345} is an apocalyptic number.

It is an amenable number.

21161014512345 is a deficient number, since it is larger than the sum of its proper divisors (16893282014055).

21161014512345 is a wasteful number, since it uses less digits than its factorization.

21161014512345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49668 (or 49659 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 36.

Adding to 21161014512345 its reverse (54321541016112), we get a palindrome (75482555528457).

The spelling of 21161014512345 in words is "twenty-one trillion, one hundred sixty-one billion, fourteen million, five hundred twelve thousand, three hundred forty-five".