212122121212 has 24 divisors (see below), whose sum is σ = 394391316816. Its totient is φ = 99481475328.

The previous prime is 212122121209. The next prime is 212122121251. The reversal of 212122121212 is 212121221212.

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 212122121212.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5303358 + ... + 5343205.

It is an arithmetic number, because the mean of its divisors is an integer number (16432971534).

Almost surely, 2^212122121212 is an apocalyptic number.

It is an amenable number.

212122121212 is a deficient number, since it is larger than the sum of its proper divisors (182269195604).

212122121212 is a wasteful number, since it uses less digits than its factorization.

212122121212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10646877 (or 10646875 counting only the distinct ones).

The product of its digits is 128, while the sum is 19.

Adding to 212122121212 its reverse (212121221212), we get a palindrome (424243342424).

The spelling of 212122121212 in words is "two hundred twelve billion, one hundred twenty-two million, one hundred twenty-one thousand, two hundred twelve".