1211212122112 has 48 divisors (see below), whose sum is σ = 2424829761900. Its totient is φ = 604856647680.

The previous prime is 1211212122077. The next prime is 1211212122119. The reversal of 1211212122112 is 2112212121121.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 820517118976 + 390695003136 = 905824^2 + 625056^2 .

It is a nude number because it is divisible by every one of its digits and also a Zuckerman number because it is divisible by the product of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 1211212122112.

It is not an unprimeable number, because it can be changed into a prime (1211212122119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1291312 + ... + 2022352.

Almost surely, 2^{1211212122112} 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 1211212122112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1212414880950).

1211212122112 is an abundant number, since it is smaller than the sum of its proper divisors (1213617639788).

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

1211212122112 is an frugal number, since it uses more digits than its factorization.

1211212122112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 731872 (or 731852 counting only the distinct ones).

The product of its digits is 64, while the sum is 19.

Adding to 1211212122112 its reverse (2112212121121), we get a palindrome (3323424243233).

Subtracting 1211212122112 from its reverse (2112212121121), we obtain a palindrome (900999999009).

The spelling of 1211212122112 in words is "one trillion, two hundred eleven billion, two hundred twelve million, one hundred twenty-two thousand, one hundred twelve".