12012156227 has 4 divisors (see below), whose sum is σ = 12336809136. Its totient is φ = 11687503320.

The previous prime is 12012156209. The next prime is 12012156251. The reversal of 12012156227 is 72265121021.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12012156227 - 2⁸ = 12012155971 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12012156227.

It is not an unprimeable number, because it can be changed into a prime (12012156287) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 162326399 + ... + 162326472.

It is an arithmetic number, because the mean of its divisors is an integer number (3084202284).

Almost surely, 2^12012156227 is an apocalyptic number.

12012156227 is a deficient number, since it is larger than the sum of its proper divisors (324652909).

12012156227 is an equidigital number, since it uses as much as digits as its factorization.

12012156227 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 324652908.

The product of its (nonzero) digits is 3360, while the sum is 29.

Adding to 12012156227 its reverse (72265121021), we get a palindrome (84277277248).

The spelling of 12012156227 in words is "twelve billion, twelve million, one hundred fifty-six thousand, two hundred twenty-seven".