212121222112 has 24 divisors (see below), whose sum is σ = 439593323400. Its totient is φ = 100478473344.

The previous prime is 212121222107. The next prime is 212121222143. The reversal of 212121222112 is 211222121212.

It is a Harshad number since it is a multiple of its sum of digits (19).

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 212121222112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 174441187 + ... + 174442402.

It is an arithmetic number, because the mean of its divisors is an integer number (18316388475).

Almost surely, 2^212121222112 is an apocalyptic number.

It is an amenable number.

212121222112 is an abundant number, since it is smaller than the sum of its proper divisors (227472101288).

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

212121222112 is a wasteful number, since it uses less digits than its factorization.

212121222112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 348883618 (or 348883610 counting only the distinct ones).

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

Adding to 212121222112 its reverse (211222121212), we get a palindrome (423343343324).

The spelling of 212121222112 in words is "two hundred twelve billion, one hundred twenty-one million, two hundred twenty-two thousand, one hundred twelve".