212120131212 has 120 divisors (see below), whose sum is σ = 605121464640. Its totient is φ = 64259036640.

The previous prime is 212120131121. The next prime is 212120131247. The reversal of 212120131212 is 212131021212.

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

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 39 ways as a sum of consecutive naturals, for example, 15029463 + ... + 15043569.

It is an arithmetic number, because the mean of its divisors is an integer number (5042678872).

Almost surely, 2^212120131212 is an apocalyptic number.

212120131212 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 212120131212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (302560732320).

212120131212 is an abundant number, since it is smaller than the sum of its proper divisors (393001333428).

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

212120131212 is a wasteful number, since it uses less digits than its factorization.

212120131212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18353 (or 18342 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 212120131212 its reverse (212131021212), we get a palindrome (424251152424).

Subtracting 212120131212 from its reverse (212131021212), we obtain a square (10890000 = 3300²).

The spelling of 212120131212 in words is "two hundred twelve billion, one hundred twenty million, one hundred thirty-one thousand, two hundred twelve".