211112221212 has 96 divisors (see below), whose sum is σ = 570578534400. Its totient is φ = 67426344000.

The previous prime is 211112221211. The next prime is 211112221249. The reversal of 211112221212 is 212122211112.

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

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211112221211) 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 31 ways as a sum of consecutive naturals, for example, 25989 + ... + 650307.

It is an arithmetic number, because the mean of its divisors is an integer number (5943526400).

Almost surely, 2^211112221212 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 211112221212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (285289267200).

211112221212 is an abundant number, since it is smaller than the sum of its proper divisors (359466313188).

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

211112221212 is a wasteful number, since it uses less digits than its factorization.

211112221212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 624464 (or 624456 counting only the distinct ones).

The product of its digits is 64, while the sum is 18.

Adding to 211112221212 its reverse (212122211112), we get a palindrome (423234432324).

The spelling of 211112221212 in words is "two hundred eleven billion, one hundred twelve million, two hundred twenty-one thousand, two hundred twelve".