21116152513 has 4 divisors (see below), whose sum is σ = 21126623620. Its totient is φ = 21105681408.

The previous prime is 21116152487. The next prime is 21116152543. The reversal of 21116152513 is 31525161112.

21116152513 = 102752² + 102753².

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10558179009 + 10557973504 = 102753^2 + 102752^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21116152513 is a prime.

It is a super-3 number, since 3×21116152513³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21116152543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5232528 + ... + 5236561.

It is an arithmetic number, because the mean of its divisors is an integer number (5281655905).

Almost surely, 2^21116152513 is an apocalyptic number.

21116152513 is the 102753-rd centered square number.

It is an amenable number.

21116152513 is a deficient number, since it is larger than the sum of its proper divisors (10471107).

21116152513 is a wasteful number, since it uses less digits than its factorization.

21116152513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10471106.

The product of its digits is 1800, while the sum is 28.

The spelling of 21116152513 in words is "twenty-one billion, one hundred sixteen million, one hundred fifty-two thousand, five hundred thirteen".