121312230312 has 192 divisors, whose sum is σ = 387429212160. Its totient is φ = 30962131200.

The previous prime is 121312230289. The next prime is 121312230383. The reversal of 121312230312 is 213032213121.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 811237 + ... + 949067.

It is an arithmetic number, because the mean of its divisors is an integer number (2017860480).

Almost surely, 2^121312230312 is an apocalyptic number.

121312230312 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 121312230312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (193714606080).

121312230312 is an abundant number, since it is smaller than the sum of its proper divisors (266116981848).

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

121312230312 is a wasteful number, since it uses less digits than its factorization.

121312230312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137904 (or 137887 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 121312230312 its reverse (213032213121), we get a palindrome (334344443433).

The spelling of 121312230312 in words is "one hundred twenty-one billion, three hundred twelve million, two hundred thirty thousand, three hundred twelve".