21116500061503 has 64 divisors (see below), whose sum is σ = 27306045619200. Its totient is φ = 16184612505600.

The previous prime is 21116500061491. The next prime is 21116500061533. The reversal of 21116500061503 is 30516000561112.

It is a happy number.

It is not a de Polignac number, because 21116500061503 - 2¹⁷ = 21116499930431 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21116500061533) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 170066283 + ... + 170190403.

It is an arithmetic number, because the mean of its divisors is an integer number (426656962800).

Almost surely, 2^{21116500061503} is an apocalyptic number.

21116500061503 is a deficient number, since it is larger than the sum of its proper divisors (6189545557697).

21116500061503 is a wasteful number, since it uses less digits than its factorization.

21116500061503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124893 (or 124879 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 31.

The spelling of 21116500061503 in words is "twenty-one trillion, one hundred sixteen billion, five hundred million, sixty-one thousand, five hundred three".