21152513115 has 24 divisors (see below), whose sum is σ = 37020328800. Its totient is φ = 11171810304.

The previous prime is 21152513101. The next prime is 21152513119. The reversal of 21152513115 is 51131525112.

It is a happy number.

21152513115 is a `hidden beast` number, since 2 + 1 + 1 + 525 + 131 + 1 + 5 = 666.

It is not a de Polignac number, because 21152513115 - 2¹⁰ = 21152512091 is a prime.

It is a super-2 number, since 2×21152513115² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21152513119) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2277190 + ... + 2286459.

It is an arithmetic number, because the mean of its divisors is an integer number (1542513700).

Almost surely, 2^21152513115 is an apocalyptic number.

21152513115 is a deficient number, since it is larger than the sum of its proper divisors (15867815685).

21152513115 is a wasteful number, since it uses less digits than its factorization.

21152513115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4563763 (or 4563760 counting only the distinct ones).

The product of its digits is 1500, while the sum is 27.

The spelling of 21152513115 in words is "twenty-one billion, one hundred fifty-two million, five hundred thirteen thousand, one hundred fifteen".