312113121220 has 48 divisors (see below), whose sum is σ = 690038697600. Its totient is φ = 118256544000.

The previous prime is 312113121179. The next prime is 312113121227. The reversal of 312113121220 is 22121311213.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is not an unprimeable number, because it can be changed into a prime (312113121227) by changing a digit.

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, 2601721 + ... + 2719039.

It is an arithmetic number, because the mean of its divisors is an integer number (14375806200).

Almost surely, 2^312113121220 is an apocalyptic number.

It is an amenable number.

312113121220 is an abundant number, since it is smaller than the sum of its proper divisors (377925576380).

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

312113121220 is a wasteful number, since it uses less digits than its factorization.

312113121220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124348 (or 124346 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 312113121220 its reverse (22121311213), we get a palindrome (334234432433).

The spelling of 312113121220 in words is "three hundred twelve billion, one hundred thirteen million, one hundred twenty-one thousand, two hundred twenty".