231312221320312 has 128 divisors (see below), whose sum is σ = 508523984928000. Its totient is φ = 97465462364160.

The previous prime is 231312221320303. The next prime is 231312221320331. The reversal of 231312221320312 is 213023122213132.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 679302514 + ... + 679642942.

It is an arithmetic number, because the mean of its divisors is an integer number (3972843632250).

Almost surely, 2^{231312221320312} is an apocalyptic number.

231312221320312 is a gapful number since it is divisible by the number (22) 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 231312221320312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (254261992464000).

231312221320312 is an abundant number, since it is smaller than the sum of its proper divisors (277211763607688).

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

231312221320312 is a wasteful number, since it uses less digits than its factorization.

231312221320312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 347309 (or 347305 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 28.

Adding to 231312221320312 its reverse (213023122213132), we get a palindrome (444335343533444).

The spelling of 231312221320312 in words is "two hundred thirty-one trillion, three hundred twelve billion, two hundred twenty-one million, three hundred twenty thousand, three hundred twelve".