1213313111200 has 144 divisors (see below), whose sum is σ = 3120229667520. Its totient is φ = 459437598720.

The previous prime is 1213313111159. The next prime is 1213313111203. The reversal of 1213313111200 is 21113133121.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is not an unprimeable number, because it can be changed into a prime (1213313111203) 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 23 ways as a sum of consecutive naturals, for example, 20749204 + ... + 20807596.

It is an arithmetic number, because the mean of its divisors is an integer number (21668261580).

Almost surely, 2^{1213313111200} is an apocalyptic number.

1213313111200 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 1213313111200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1560114833760).

1213313111200 is an abundant number, since it is smaller than the sum of its proper divisors (1906916556320).

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

1213313111200 is a wasteful number, since it uses less digits than its factorization.

1213313111200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59799 (or 59786 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 19.

Adding to 1213313111200 its reverse (21113133121), we get a palindrome (1234426244321).

The spelling of 1213313111200 in words is "one trillion, two hundred thirteen billion, three hundred thirteen million, one hundred eleven thousand, two hundred".