211122112212 has 144 divisors (see below), whose sum is σ = 585835548480. Its totient is φ = 63576576000.

The previous prime is 211122112199. The next prime is 211122112247. The reversal of 211122112212 is 212211221112.

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 an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 43972212 + ... + 43977012.

It is an arithmetic number, because the mean of its divisors is an integer number (4068302420).

Almost surely, 2^211122112212 is an apocalyptic number.

211122112212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 211122112212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (292917774240).

211122112212 is an abundant number, since it is smaller than the sum of its proper divisors (374713436268).

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

211122112212 is a wasteful number, since it uses less digits than its factorization.

211122112212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5494 (or 5489 counting only the distinct ones).

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

Adding to 211122112212 its reverse (212211221112), we get a palindrome (423333333324).

The spelling of 211122112212 in words is "two hundred eleven billion, one hundred twenty-two million, one hundred twelve thousand, two hundred twelve".