1231120313312 has 48 divisors (see below), whose sum is σ = 2531095312032. Its totient is φ = 588343641600.

The previous prime is 1231120313279. The next prime is 1231120313341. The reversal of 1231120313312 is 2133130211321.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 314678 + ... + 1600394.

It is an arithmetic number, because the mean of its divisors is an integer number (52731152334).

Almost surely, 2^{1231120313312} 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 1231120313312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1265547656016).

1231120313312 is an abundant number, since it is smaller than the sum of its proper divisors (1299974998720).

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

1231120313312 is a wasteful number, since it uses less digits than its factorization.

1231120313312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1287051 (or 1287043 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 23.

Adding to 1231120313312 its reverse (2133130211321), we get a palindrome (3364250524633).

The spelling of 1231120313312 in words is "one trillion, two hundred thirty-one billion, one hundred twenty million, three hundred thirteen thousand, three hundred twelve".