12121222012 has 12 divisors (see below), whose sum is σ = 21705444376. Its totient is φ = 5919666480.

The previous prime is 12121221997. The next prime is 12121222013. The reversal of 12121222012 is 21022212121.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12121222013) 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, 35235939 + ... + 35236282.

Almost surely, 2^12121222012 is an apocalyptic number.

It is an amenable number.

12121222012 is a deficient number, since it is larger than the sum of its proper divisors (9584222364).

12121222012 is a wasteful number, since it uses less digits than its factorization.

12121222012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70472268 (or 70472266 counting only the distinct ones).

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

Adding to 12121222012 its reverse (21022212121), we get a palindrome (33143434133).

The spelling of 12121222012 in words is "twelve billion, one hundred twenty-one million, two hundred twenty-two thousand, twelve".