212011222212 has 36 divisors (see below), whose sum is σ = 541223376876. Its totient is φ = 69970699200.

The previous prime is 212011222211. The next prime is 212011222223. The reversal of 212011222212 is 212222110212.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 197221257216 + 14789964996 = 444096^2 + 121614^2 .

It is a tau number, because it is divible by the number of its divisors (36).

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

It is not an unprimeable number, because it can be changed into a prime (212011222211) 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 11 ways as a sum of consecutive naturals, for example, 29150823 + ... + 29158094.

It is an arithmetic number, because the mean of its divisors is an integer number (15033982691).

Almost surely, 2^212011222212 is an apocalyptic number.

It is an amenable number.

212011222212 is an abundant number, since it is smaller than the sum of its proper divisors (329212154664).

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

212011222212 is a wasteful number, since it uses less digits than its factorization.

212011222212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58309028 (or 58309023 counting only the distinct ones).

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

Adding to 212011222212 its reverse (212222110212), we get a palindrome (424233332424).

The spelling of 212011222212 in words is "two hundred twelve billion, eleven million, two hundred twenty-two thousand, two hundred twelve".