11515212520 has 128 divisors (see below), whose sum is σ = 31119264000. Its totient is φ = 3751888896.

The previous prime is 11515212491. The next prime is 11515212521. The reversal of 11515212520 is 2521251511.

It is a happy number.

11515212520 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (11515212521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 432556 + ... + 458404.

It is an arithmetic number, because the mean of its divisors is an integer number (243119250).

Almost surely, 2^11515212520 is an apocalyptic number.

11515212520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11515212520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15559632000).

11515212520 is an abundant number, since it is smaller than the sum of its proper divisors (19604051480).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11515212520 is a wasteful number, since it uses less digits than its factorization.

11515212520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25947 (or 25943 counting only the distinct ones).

The product of its (nonzero) digits is 1000, while the sum is 25.

The spelling of 11515212520 in words is "eleven billion, five hundred fifteen million, two hundred twelve thousand, five hundred twenty".