111212221212012 has 24 divisors (see below), whose sum is σ = 265016356932096. Its totient is φ = 36282001246288.

The previous prime is 111212221212011. The next prime is 111212221212017. The reversal of 111212221212012 is 210212122212111.

It is a self number, because there is not a number n which added to its sum of digits gives 111212221212012.

It is not an unprimeable number, because it can be changed into a prime (111212221212011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 98592394128 + ... + 98592395255.

It is an arithmetic number, because the mean of its divisors is an integer number (11042348205504).

Almost surely, 2^{111212221212012} is an apocalyptic number.

111212221212012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

111212221212012 is an abundant number, since it is smaller than the sum of its proper divisors (153804135720084).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

111212221212012 is a wasteful number, since it uses less digits than its factorization.

111212221212012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197184789437 (or 197184789435 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 21.

Adding to 111212221212012 its reverse (210212122212111), we get a palindrome (321424343424123).

The spelling of 111212221212012 in words is "one hundred eleven trillion, two hundred twelve billion, two hundred twenty-one million, two hundred twelve thousand, twelve".