12155112 has 48 divisors (see below), whose sum is σ = 33080580. Its totient is φ = 4032000.

The previous prime is 12155081. The next prime is 12155123. The reversal of 12155112 is 21155121.

It can be written as a sum of positive squares in 2 ways, for example, as 12152196 + 2916 = 3486^2 + 54^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 28662 + ... + 29082.

Almost surely, 2^12155112 is an apocalyptic number.

12155112 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

12155112 is an abundant number, since it is smaller than the sum of its proper divisors (20925468).

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

12155112 is a wasteful number, since it uses less digits than its factorization.

12155112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 834 (or 827 counting only the distinct ones).

The product of its digits is 100, while the sum is 18.

The square root of 12155112 is about 3486.4182193191. The cubic root of 12155112 is about 229.9250669571.

Subtracting 12155112 from its reverse (21155121), we obtain a palindrome (9000009).

The spelling of 12155112 in words is "twelve million, one hundred fifty-five thousand, one hundred twelve".