12515221242 has 48 divisors (see below), whose sum is σ = 28333663488. Its totient is φ = 3984948000.

The previous prime is 12515221231. The next prime is 12515221261. The reversal of 12515221242 is 24212251521.

12515221242 is a `hidden beast` number, since 1 + 2 + 515 + 22 + 124 + 2 = 666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 290788 + ... + 331040.

It is an arithmetic number, because the mean of its divisors is an integer number (590284656).

Almost surely, 2^12515221242 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12515221242, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14166831744).

12515221242 is an abundant number, since it is smaller than the sum of its proper divisors (15818442246).

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

12515221242 is a wasteful number, since it uses less digits than its factorization.

12515221242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41035 (or 41032 counting only the distinct ones).

The product of its digits is 3200, while the sum is 27.

Adding to 12515221242 its reverse (24212251521), we get a palindrome (36727472763).

The spelling of 12515221242 in words is "twelve billion, five hundred fifteen million, two hundred twenty-one thousand, two hundred forty-two".