2121312031312 has 40 divisors (see below), whose sum is σ = 4327833938400. Its totient is φ = 1004489695872.

The previous prime is 2121312031273. The next prime is 2121312031361. The reversal of 2121312031312 is 2131302131212.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 293683 + ... + 2080594.

It is an arithmetic number, because the mean of its divisors is an integer number (108195848460).

Almost surely, 2^{2121312031312} is an apocalyptic number.

It is an amenable number.

2121312031312 is an abundant number, since it is smaller than the sum of its proper divisors (2206521907088).

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

2121312031312 is a wasteful number, since it uses less digits than its factorization.

2121312031312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2377243 (or 2377237 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 2121312031312 its reverse (2131302131212), we get a palindrome (4252614162524).

The spelling of 2121312031312 in words is "two trillion, one hundred twenty-one billion, three hundred twelve million, thirty-one thousand, three hundred twelve".