12015321516 has 48 divisors (see below), whose sum is σ = 33982730880. Its totient is φ = 3641006160.

The previous prime is 12015321497. The next prime is 12015321541. The reversal of 12015321516 is 61512351021.

12015321516 is a `hidden beast` number, since 120 + 1 + 5 + 3 + 21 + 516 = 666.

It is a super-2 number, since 2×12015321516² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 12015321516.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5055766 + ... + 5058141.

It is an arithmetic number, because the mean of its divisors is an integer number (707973560).

Almost surely, 2^12015321516 is an apocalyptic number.

It is an amenable number.

12015321516 is an abundant number, since it is smaller than the sum of its proper divisors (21967409364).

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

12015321516 is a wasteful number, since it uses less digits than its factorization.

12015321516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10113931 (or 10113923 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 27.

Adding to 12015321516 its reverse (61512351021), we get a palindrome (73527672537).

The spelling of 12015321516 in words is "twelve billion, fifteen million, three hundred twenty-one thousand, five hundred sixteen".