12221021212 has 6 divisors (see below), whose sum is σ = 21386787128. Its totient is φ = 6110510604.

The previous prime is 12221021207. The next prime is 12221021213. The reversal of 12221021212 is 21212012221.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12221021213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1527627648 + ... + 1527627655.

Almost surely, 2^12221021212 is an apocalyptic number.

It is an amenable number.

12221021212 is a deficient number, since it is larger than the sum of its proper divisors (9165765916).

12221021212 is a wasteful number, since it uses less digits than its factorization.

12221021212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3055255307 (or 3055255305 counting only the distinct ones).

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

Adding to 12221021212 its reverse (21212012221), we get a palindrome (33433033433).

The spelling of 12221021212 in words is "twelve billion, two hundred twenty-one million, twenty-one thousand, two hundred twelve".