1311222011200 has 84 divisors (see below), whose sum is σ = 3396237616960. Its totient is φ = 496884119040.

The previous prime is 1311222011189. The next prime is 1311222011233. The reversal of 1311222011200 is 21102221131.

It is a super-3 number, since 3×1311222011200³ (a number of 37 digits) contains 333 as substring.

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 polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21535752 + ... + 21596551.

Almost surely, 2^{1311222011200} is an apocalyptic number.

1311222011200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1311222011200 is an abundant number, since it is smaller than the sum of its proper divisors (2085015605760).

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

1311222011200 is a wasteful number, since it uses less digits than its factorization.

1311222011200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43132344 (or 43132329 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 1311222011200 its reverse (21102221131), we get a palindrome (1332324232331).

The spelling of 1311222011200 in words is "one trillion, three hundred eleven billion, two hundred twenty-two million, eleven thousand, two hundred".