1311221010112 has 56 divisors (see below), whose sum is σ = 2812220909456. Its totient is φ = 602994060288.

The previous prime is 1311221010037. The next prime is 1311221010119. The reversal of 1311221010112 is 2110101221131.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is not an unprimeable number, because it can be changed into a prime (1311221010119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2614278 + ... + 3075205.

It is an arithmetic number, because the mean of its divisors is an integer number (50218230526).

Almost surely, 2^{1311221010112} is an apocalyptic number.

It is an amenable number.

1311221010112 is an abundant number, since it is smaller than the sum of its proper divisors (1500999899344).

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

1311221010112 is a wasteful number, since it uses less digits than its factorization.

1311221010112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5689785 (or 5689775 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 16.

Adding to 1311221010112 its reverse (2110101221131), we get a palindrome (3421322231243).

The spelling of 1311221010112 in words is "one trillion, three hundred eleven billion, two hundred twenty-one million, ten thousand, one hundred twelve".