1311012123140 has 144 divisors (see below), whose sum is σ = 2988343108800. Its totient is φ = 481650084864.

The previous prime is 1311012123133. The next prime is 1311012123149. The reversal of 1311012123140 is 413212101131.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (1311012123149) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 119470694 + ... + 119481666.

It is an arithmetic number, because the mean of its divisors is an integer number (20752382700).

Almost surely, 2^{1311012123140} is an apocalyptic number.

1311012123140 is a gapful number since it is divisible by the number (10) 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 1311012123140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1494171554400).

1311012123140 is an abundant number, since it is smaller than the sum of its proper divisors (1677330985660).

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

1311012123140 is a wasteful number, since it uses less digits than its factorization.

1311012123140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11206 (or 11131 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 1311012123140 its reverse (413212101131), we get a palindrome (1724224224271).

The spelling of 1311012123140 in words is "one trillion, three hundred eleven billion, twelve million, one hundred twenty-three thousand, one hundred forty".