12221212012 has 24 divisors (see below), whose sum is σ = 22446025056. Its totient is φ = 5811134208.

The previous prime is 12221212001. The next prime is 12221212013. The reversal of 12221212012 is 21021212221.

It is a happy number.

12221212012 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (12221212013) 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 7 ways as a sum of consecutive naturals, for example, 368013 + ... + 399844.

It is an arithmetic number, because the mean of its divisors is an integer number (935251044).

Almost surely, 2^12221212012 is an apocalyptic number.

It is an amenable number.

12221212012 is a deficient number, since it is larger than the sum of its proper divisors (10224813044).

12221212012 is a wasteful number, since it uses less digits than its factorization.

12221212012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 768057 (or 768055 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 12221212012 its reverse (21021212221), we get a palindrome (33242424233).

The spelling of 12221212012 in words is "twelve billion, two hundred twenty-one million, two hundred twelve thousand, twelve".