1311101321200 has 240 divisors, whose sum is σ = 3551056324992. Its totient is φ = 461059200000.

The previous prime is 1311101321197. The next prime is 1311101321237. The reversal of 1311101321200 is 21231011131.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 19074895 + ... + 19143505.

Almost surely, 2^{1311101321200} is an apocalyptic number.

1311101321200 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 1311101321200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1775528162496).

1311101321200 is an abundant number, since it is smaller than the sum of its proper divisors (2239955003792).

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

1311101321200 is a wasteful number, since it uses less digits than its factorization.

1311101321200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68784 (or 68773 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 1311101321200 its reverse (21231011131), we get a palindrome (1332332332331).

The spelling of 1311101321200 in words is "one trillion, three hundred eleven billion, one hundred one million, three hundred twenty-one thousand, two hundred".