12151221532 has 12 divisors (see below), whose sum is σ = 21265549200. Its totient is φ = 6075350336.

The previous prime is 12151221503. The next prime is 12151221547. The reversal of 12151221532 is 23512215121.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 12151221497 and 12151221506.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71913 + ... + 171679.

It is an arithmetic number, because the mean of its divisors is an integer number (1772129100).

Almost surely, 2^12151221532 is an apocalyptic number.

It is an amenable number.

12151221532 is a deficient number, since it is larger than the sum of its proper divisors (9114327668).

12151221532 is a wasteful number, since it uses less digits than its factorization.

12151221532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130220 (or 130218 counting only the distinct ones).

The product of its digits is 1200, while the sum is 25.

Adding to 12151221532 its reverse (23512215121), we get a palindrome (35663436653).

The spelling of 12151221532 in words is "twelve billion, one hundred fifty-one million, two hundred twenty-one thousand, five hundred thirty-two".