212112211221012 has 24 divisors (see below), whose sum is σ = 494934442480800. Its totient is φ = 70703220459616.

The previous prime is 212112211221011. The next prime is 212112211221143. The reversal of 212112211221012 is 210122112211212.

It is a self number, because there is not a number n which added to its sum of digits gives 212112211221012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212112211221011) 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, 105203187 + ... + 107200442.

It is an arithmetic number, because the mean of its divisors is an integer number (20622268436700).

Almost surely, 2^{212112211221012} is an apocalyptic number.

It is an amenable number.

212112211221012 is an abundant number, since it is smaller than the sum of its proper divisors (282822231259788).

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

212112211221012 is a wasteful number, since it uses less digits than its factorization.

212112211221012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212486855 (or 212486853 counting only the distinct ones).

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

Adding to 212112211221012 its reverse (210122112211212), we get a palindrome (422234323432224).

The spelling of 212112211221012 in words is "two hundred twelve trillion, one hundred twelve billion, two hundred eleven million, two hundred twenty-one thousand, twelve".