212111112 has 32 divisors (see below), whose sum is σ = 531528480. Its totient is φ = 70536960.

The previous prime is 212111111. The next prime is 212111147. The reversal of 212111112 is 211111212.

It is a super-2 number, since 2×212111112² = 89982247667753088, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a nude number because it is divisible by every one of its digits and also a Zuckerman number because it is divisible by the product of its digits.

It is not an unprimeable number, because it can be changed into a prime (212111111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 187 + ... + 20597.

It is an arithmetic number, because the mean of its divisors is an integer number (16610265).

Almost surely, 2^212111112 is an apocalyptic number.

It is an amenable number.

212111112 is an abundant number, since it is smaller than the sum of its proper divisors (319417368).

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

212111112 is a wasteful number, since it uses less digits than its factorization.

212111112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20853 (or 20849 counting only the distinct ones).

The product of its digits is 8, while the sum is 12.

The square root of 212111112 is about 14564.0348804856. The cubic root of 212111112 is about 596.3773491328.

Adding to 212111112 its reverse (211111212), we get a palindrome (423222324).

The spelling of 212111112 in words is "two hundred twelve million, one hundred eleven thousand, one hundred twelve".