21516317702715 has 16 divisors (see below), whose sum is σ = 37555754535936. Its totient is φ = 10432154037600.

The previous prime is 21516317702669. The next prime is 21516317702717. The reversal of 21516317702715 is 51720771361512.

It is not a de Polignac number, because 21516317702715 - 2¹⁶ = 21516317637179 is a prime.

It is a super-3 number, since 3×21516317702715³ (a number of 41 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (21516317702717) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 65200962571 + ... + 65200962900.

It is an arithmetic number, because the mean of its divisors is an integer number (2347234658496).

Almost surely, 2^{21516317702715} is an apocalyptic number.

21516317702715 is a deficient number, since it is larger than the sum of its proper divisors (16039436833221).

21516317702715 is a wasteful number, since it uses less digits than its factorization.

21516317702715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130401925490.

The product of its (nonzero) digits is 617400, while the sum is 48.

The spelling of 21516317702715 in words is "twenty-one trillion, five hundred sixteen billion, three hundred seventeen million, seven hundred two thousand, seven hundred fifteen".