121212212112 has 60 divisors (see below), whose sum is σ = 342584556444. Its totient is φ = 40004025600.

The previous prime is 121212212083. The next prime is 121212212123. The reversal of 121212212112 is 211212212121.

It can be written as a sum of positive squares in 2 ways, for example, as 102863884176 + 18348327936 = 320724^2 + 135456^2 .

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 an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4152543 + ... + 4181630.

Almost surely, 2^121212212112 is an apocalyptic number.

121212212112 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

121212212112 is an abundant number, since it is smaller than the sum of its proper divisors (221372344332).

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

121212212112 is a wasteful number, since it uses less digits than its factorization.

121212212112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8334288 (or 8334279 counting only the distinct ones).

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

Adding to 121212212112 its reverse (211212212121), we get a palindrome (332424424233).

Subtracting 121212212112 from its reverse (211212212121), we obtain a palindrome (90000000009).

The spelling of 121212212112 in words is "one hundred twenty-one billion, two hundred twelve million, two hundred twelve thousand, one hundred twelve".