211330122012 has 84 divisors (see below), whose sum is σ = 554819732376. Its totient is φ = 70401221280.

The previous prime is 211330122011. The next prime is 211330122013. The reversal of 211330122012 is 210221033112.

211330122012 is a `hidden beast` number, since 211 + 330 + 122 + 0 + 1 + 2 = 666.

It is an interprime number because it is at equal distance from previous prime (211330122011) and next prime (211330122013).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211330122011) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 5055943 + ... + 5097569.

It is an arithmetic number, because the mean of its divisors is an integer number (6604996814).

Almost surely, 2^211330122012 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 211330122012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (277409866188).

211330122012 is an abundant number, since it is smaller than the sum of its proper divisors (343489610364).

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

211330122012 is a wasteful number, since it uses less digits than its factorization.

211330122012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43390 (or 43373 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 211330122012 its reverse (210221033112), we get a palindrome (421551155124).

The spelling of 211330122012 in words is "two hundred eleven billion, three hundred thirty million, one hundred twenty-two thousand, twelve".