321312111012 has 96 divisors (see below), whose sum is σ = 840177959040. Its totient is φ = 106187189760.

The previous prime is 321312111011. The next prime is 321312111031. The reversal of 321312111012 is 210111213123.

321312111012 is a `hidden beast` number, since 321 + 31 + 211 + 101 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (321312111011) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11986168 + ... + 12012944.

It is an arithmetic number, because the mean of its divisors is an integer number (8751853740).

Almost surely, 2^321312111012 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 321312111012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (420088979520).

321312111012 is an abundant number, since it is smaller than the sum of its proper divisors (518865848028).

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

321312111012 is a wasteful number, since it uses less digits than its factorization.

321312111012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27738 (or 27730 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

Adding to 321312111012 its reverse (210111213123), we get a palindrome (531423324135).

The spelling of 321312111012 in words is "three hundred twenty-one billion, three hundred twelve million, one hundred eleven thousand, twelve".