1155221440000 has 200 divisors, whose sum is σ = 2889478452168. Its totient is φ = 461260800000.

The previous prime is 1155221439991. The next prime is 1155221440007. The reversal of 1155221440000 is 441225511.

It is a tau number, because it is divible by the number of its divisors (200).

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1155221440007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 197437075 + ... + 197442925.

Almost surely, 2^{1155221440000} is an apocalyptic number.

1155221440000 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 1155221440000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1444739226084).

1155221440000 is an abundant number, since it is smaller than the sum of its proper divisors (1734257012168).

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

1155221440000 is an frugal number, since it uses more digits than its factorization.

1155221440000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6506 (or 6475 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 25.

Adding to 1155221440000 its reverse (441225511), we get a palindrome (1155662665511).

The spelling of 1155221440000 in words is "one trillion, one hundred fifty-five billion, two hundred twenty-one million, four hundred forty thousand".