212120221012 has 24 divisors (see below), whose sum is σ = 425198120256. Its totient is φ = 90703449408.

The previous prime is 212120221009. The next prime is 212120221067. The reversal of 212120221012 is 210122021212.

It is a happy number.

212120221012 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

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 7 ways as a sum of consecutive naturals, for example, 8538073 + ... + 8562880.

It is an arithmetic number, because the mean of its divisors is an integer number (17716588344).

Almost surely, 2^212120221012 is an apocalyptic number.

It is an amenable number.

212120221012 is an abundant number, since it is smaller than the sum of its proper divisors (213077899244).

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

212120221012 is a wasteful number, since it uses less digits than its factorization.

212120221012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17101407 (or 17101405 counting only the distinct ones).

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

Adding to 212120221012 its reverse (210122021212), we get a palindrome (422242242224).

The spelling of 212120221012 in words is "two hundred twelve billion, one hundred twenty million, two hundred twenty-one thousand, twelve".