12156212 has 18 divisors (see below), whose sum is σ = 21627522. Its totient is φ = 5978544.

The previous prime is 12156211. The next prime is 12156217. The reversal of 12156212 is 21265121.

It can be written as a sum of positive squares in only one way, i.e., 12138256 + 17956 = 3484^2 + 134^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12156211) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 17618 + ... + 18294.

It is an arithmetic number, because the mean of its divisors is an integer number (1201529).

Almost surely, 2^12156212 is an apocalyptic number.

It is an amenable number.

12156212 is a deficient number, since it is larger than the sum of its proper divisors (9471310).

12156212 is an equidigital number, since it uses as much as digits as its factorization.

12156212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 815 (or 746 counting only the distinct ones).

The product of its digits is 240, while the sum is 20.

The square root of 12156212 is about 3486.5759707771. The cubic root of 12156212 is about 229.9320025835.

The spelling of 12156212 in words is "twelve million, one hundred fifty-six thousand, two hundred twelve".