121111010112 has 112 divisors (see below), whose sum is σ = 334772812800. Its totient is φ = 38592153600.

The previous prime is 121111010089. The next prime is 121111010161. The reversal of 121111010112 is 211010111121.

It is a Harshad number since it is a multiple of its sum of digits (12).

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 15 ways as a sum of consecutive naturals, for example, 454689 + ... + 670047.

Almost surely, 2^121111010112 is an apocalyptic number.

121111010112 is a gapful number since it is divisible by the number (12) 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 121111010112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (167386406400).

121111010112 is an abundant number, since it is smaller than the sum of its proper divisors (213661802688).

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

121111010112 is a wasteful number, since it uses less digits than its factorization.

121111010112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215504 (or 215494 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 12.

Adding to 121111010112 its reverse (211010111121), we get a palindrome (332121121233).

The spelling of 121111010112 in words is "one hundred twenty-one billion, one hundred eleven million, ten thousand, one hundred twelve".