1311020123112 has 64 divisors (see below), whose sum is σ = 4161968649600. Its totient is φ = 374577177600.

The previous prime is 1311020123099. The next prime is 1311020123117. The reversal of 1311020123112 is 2113210201131.

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 (1311020123117) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 433536889 + ... + 433539912.

It is an arithmetic number, because the mean of its divisors is an integer number (65030760150).

Almost surely, 2^{1311020123112} is an apocalyptic number.

1311020123112 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1311020123112 is an abundant number, since it is smaller than the sum of its proper divisors (2850948526488).

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

1311020123112 is a wasteful number, since it uses less digits than its factorization.

1311020123112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 867076823 (or 867076813 counting only the distinct ones).

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

Adding to 1311020123112 its reverse (2113210201131), we get a palindrome (3424230324243).

The spelling of 1311020123112 in words is "one trillion, three hundred eleven billion, twenty million, one hundred twenty-three thousand, one hundred twelve".