12111212012 has 18 divisors (see below), whose sum is σ = 22514703372. Its totient is φ = 5699393344.

The previous prime is 12111211951. The next prime is 12111212093. The reversal of 12111212012 is 21021211121.

It is a super-2 number, since 2×12111212012² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

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 in 5 ways as a sum of consecutive naturals, for example, 5237258 + ... + 5239569.

It is an arithmetic number, because the mean of its divisors is an integer number (1250816854).

Almost surely, 2^12111212012 is an apocalyptic number.

It is an amenable number.

12111212012 is a deficient number, since it is larger than the sum of its proper divisors (10403491360).

12111212012 is a wasteful number, since it uses less digits than its factorization.

12111212012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10476865 (or 10476846 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 12111212012 its reverse (21021211121), we get a palindrome (33132423133).

The spelling of 12111212012 in words is "twelve billion, one hundred eleven million, two hundred twelve thousand, twelve".