212121211112 has 32 divisors (see below), whose sum is σ = 400412305800. Its totient is φ = 105346827264.

The previous prime is 212121211063. The next prime is 212121211163. The reversal of 212121211112 is 211112121212.

It can be written as a sum of positive squares in 4 ways, for example, as 203622952516 + 8498258596 = 451246^2 + 92186^2 .

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

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 623258 + ... + 901494.

Almost surely, 2^212121211112 is an apocalyptic number.

It is an amenable number.

212121211112 is a deficient number, since it is larger than the sum of its proper divisors (188291094688).

212121211112 is a wasteful number, since it uses less digits than its factorization.

212121211112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278885 (or 278881 counting only the distinct ones).

The product of its digits is 32, while the sum is 17.

Adding to 212121211112 its reverse (211112121212), we get a palindrome (423233332324).

The spelling of 212121211112 in words is "two hundred twelve billion, one hundred twenty-one million, two hundred eleven thousand, one hundred twelve".