212122221012 has 60 divisors (see below), whose sum is σ = 597185504916. Its totient is φ = 65268374400.

The previous prime is 212122221007. The next prime is 212122221023. The reversal of 212122221012 is 210122221212.

It is a happy number.

212122221012 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 14884976016 + 197237244996 = 122004^2 + 444114^2 .

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 19 ways as a sum of consecutive naturals, for example, 25176489 + ... + 25184912.

Almost surely, 2^212122221012 is an apocalyptic number.

It is an amenable number.

212122221012 is an abundant number, since it is smaller than the sum of its proper divisors (385063283904).

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

212122221012 is a wasteful number, since it uses less digits than its factorization.

212122221012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50361430 (or 50361419 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 212122221012 its reverse (210122221212), we get a palindrome (422244442224).

The spelling of 212122221012 in words is "two hundred twelve billion, one hundred twenty-two million, two hundred twenty-one thousand, twelve".