15121222542 has 48 divisors (see below), whose sum is σ = 34630287120. Its totient is φ = 4755283200.

The previous prime is 15121222541. The next prime is 15121222549. The reversal of 15121222542 is 24522212151.

15121222542 is a `hidden beast` number, since 1 + 512 + 122 + 25 + 4 + 2 = 666.

15121222542 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15121222541) 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 23 ways as a sum of consecutive naturals, for example, 9309 + ... + 174152.

It is an arithmetic number, because the mean of its divisors is an integer number (721464315).

Almost surely, 2^15121222542 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15121222542, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17315143560).

15121222542 is an abundant number, since it is smaller than the sum of its proper divisors (19509064578).

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

15121222542 is a wasteful number, since it uses less digits than its factorization.

15121222542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183729 (or 183726 counting only the distinct ones).

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

Adding to 15121222542 its reverse (24522212151), we get a palindrome (39643434693).

The spelling of 15121222542 in words is "fifteen billion, one hundred twenty-one million, two hundred twenty-two thousand, five hundred forty-two".