212121113112 has 192 divisors, whose sum is σ = 628449269760. Its totient is φ = 64345881600.

The previous prime is 212121113101. The next prime is 212121113159. The reversal of 212121113112 is 211311121212.

It is a happy number.

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 pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 76000437 + ... + 76003227.

It is an arithmetic number, because the mean of its divisors is an integer number (3273173280).

Almost surely, 2^212121113112 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 212121113112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (314224634880).

212121113112 is an abundant number, since it is smaller than the sum of its proper divisors (416328156648).

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

212121113112 is a wasteful number, since it uses less digits than its factorization.

212121113112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4854 (or 4847 counting only the distinct ones).

The product of its digits is 48, while the sum is 18.

Adding to 212121113112 its reverse (211311121212), we get a palindrome (423432234324).

The spelling of 212121113112 in words is "two hundred twelve billion, one hundred twenty-one million, one hundred thirteen thousand, one hundred twelve".