121312112 has 40 divisors (see below), whose sum is σ = 253473360. Its totient is φ = 56056320.

The previous prime is 121312109. The next prime is 121312141. The reversal of 121312112 is 211213121.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7598 + ... + 17330.

It is an arithmetic number, because the mean of its divisors is an integer number (6336834).

Almost surely, 2^121312112 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 121312112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (126736680).

121312112 is an abundant number, since it is smaller than the sum of its proper divisors (132161248).

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

121312112 is a wasteful number, since it uses less digits than its factorization.

121312112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9801 (or 9795 counting only the distinct ones).

The product of its digits is 24, while the sum is 14.

The square root of 121312112 is about 11014.1777723078. The cubic root of 121312112 is about 495.0336500608.

Adding to 121312112 its reverse (211213121), we get a palindrome (332525233).

The spelling of 121312112 in words is "one hundred twenty-one million, three hundred twelve thousand, one hundred twelve".