212121221010012 has 72 divisors (see below), whose sum is σ = 559699963988256. Its totient is φ = 67609666548864.

The previous prime is 212121221009941. The next prime is 212121221010037. The reversal of 212121221010012 is 210010122121212.

212121221010012 is a `hidden beast` number, since 212 + 121 + 221 + 0 + 100 + 12 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

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 23 ways as a sum of consecutive naturals, for example, 41497143 + ... + 46327694.

It is an arithmetic number, because the mean of its divisors is an integer number (7773610610948).

Almost surely, 2^{212121221010012} is an apocalyptic number.

It is an amenable number.

212121221010012 is an abundant number, since it is smaller than the sum of its proper divisors (347578742978244).

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

212121221010012 is a wasteful number, since it uses less digits than its factorization.

212121221010012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87827787 (or 87827782 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 212121221010012 its reverse (210010122121212), we get a palindrome (422131343131224).

The spelling of 212121221010012 in words is "two hundred twelve trillion, one hundred twenty-one billion, two hundred twenty-one million, ten thousand, twelve".