12215421132 has 24 divisors (see below), whose sum is σ = 29040436656. Its totient is φ = 3994980288.

The previous prime is 12215421109. The next prime is 12215421139. The reversal of 12215421132 is 23112451221.

It is a happy number.

It is a super-2 number, since 2×12215421132² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12215421139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9602683 + ... + 9603954.

It is an arithmetic number, because the mean of its divisors is an integer number (1210018194).

Almost surely, 2^12215421132 is an apocalyptic number.

12215421132 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

12215421132 is an abundant number, since it is smaller than the sum of its proper divisors (16825015524).

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

12215421132 is a wasteful number, since it uses less digits than its factorization.

12215421132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19206697 (or 19206695 counting only the distinct ones).

The product of its digits is 960, while the sum is 24.

Adding to 12215421132 its reverse (23112451221), we get a palindrome (35327872353).

The spelling of 12215421132 in words is "twelve billion, two hundred fifteen million, four hundred twenty-one thousand, one hundred thirty-two".