21516340045511 has 8 divisors (see below), whose sum is σ = 22452315194880. Its totient is φ = 20580405071512.

The previous prime is 21516340045489. The next prime is 21516340045549. The reversal of 21516340045511 is 11554004361512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21516340045511 - 2¹⁴ = 21516340029127 is a prime.

It is a super-2 number, since 2×21516340045511² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21516340045561) 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 7 ways as a sum of consecutive naturals, for example, 8946875 + ... + 11094108.

It is an arithmetic number, because the mean of its divisors is an integer number (2806539399360).

Almost surely, 2^{21516340045511} is an apocalyptic number.

21516340045511 is a deficient number, since it is larger than the sum of its proper divisors (935975149369).

21516340045511 is a wasteful number, since it uses less digits than its factorization.

21516340045511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20087685.

The product of its (nonzero) digits is 72000, while the sum is 38.

The spelling of 21516340045511 in words is "twenty-one trillion, five hundred sixteen billion, three hundred forty million, forty-five thousand, five hundred eleven".