21516051135603 has 16 divisors (see below), whose sum is σ = 28693676390400. Its totient is φ = 14341230270144.

The previous prime is 21516051135587. The next prime is 21516051135629. The reversal of 21516051135603 is 30653115061512.

It is not a de Polignac number, because 21516051135603 - 2⁴ = 21516051135587 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21516051135643) 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, 517901650 + ... + 517943192.

It is an arithmetic number, because the mean of its divisors is an integer number (1793354774400).

Almost surely, 2^{21516051135603} is an apocalyptic number.

21516051135603 is a deficient number, since it is larger than the sum of its proper divisors (7177625254797).

21516051135603 is a wasteful number, since it uses less digits than its factorization.

21516051135603 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71138.

The product of its (nonzero) digits is 81000, while the sum is 39.

The spelling of 21516051135603 in words is "twenty-one trillion, five hundred sixteen billion, fifty-one million, one hundred thirty-five thousand, six hundred three".