12151221534 has 16 divisors (see below), whose sum is σ = 27002714640. Its totient is φ = 4050407160.

The previous prime is 12151221503. The next prime is 12151221547. The reversal of 12151221534 is 43512215121.

It is a happy number.

12151221534 is a `hidden beast` number, since 1 + 2 + 1 + 5 + 122 + 1 + 534 = 666.

12151221534 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

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

It is a junction number, because it is equal to n+sod(n) for n = 12151221498 and 12151221507.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 112511257 + ... + 112511364.

It is an arithmetic number, because the mean of its divisors is an integer number (1687669665).

Almost surely, 2^12151221534 is an apocalyptic number.

12151221534 is an abundant number, since it is smaller than the sum of its proper divisors (14851493106).

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

12151221534 is a wasteful number, since it uses less digits than its factorization.

12151221534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225022632 (or 225022626 counting only the distinct ones).

The product of its digits is 2400, while the sum is 27.

Adding to 12151221534 its reverse (43512215121), we get a palindrome (55663436655).

The spelling of 12151221534 in words is "twelve billion, one hundred fifty-one million, two hundred twenty-one thousand, five hundred thirty-four".