12215285172 has 72 divisors (see below), whose sum is σ = 31012450560. Its totient is φ = 4054020480.

The previous prime is 12215285171. The next prime is 12215285209. The reversal of 12215285172 is 27158251221.

12215285172 is a `hidden beast` number, since 12 + 2 + 1 + 528 + 51 + 72 = 666.

12215285172 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12215285171) 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, 14154013 + ... + 14154875.

It is an arithmetic number, because the mean of its divisors is an integer number (430728480).

Almost surely, 2^12215285172 is an apocalyptic number.

12215285172 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

12215285172 is an abundant number, since it is smaller than the sum of its proper divisors (18797165388).

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

12215285172 is a wasteful number, since it uses less digits than its factorization.

12215285172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2133 (or 2128 counting only the distinct ones).

The product of its digits is 22400, while the sum is 36.

The spelling of 12215285172 in words is "twelve billion, two hundred fifteen million, two hundred eighty-five thousand, one hundred seventy-two".