121513311200 has 72 divisors (see below), whose sum is σ = 302956047072. Its totient is φ = 47571153920.

The previous prime is 121513311193. The next prime is 121513311203. The reversal of 121513311200 is 2113315121.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121513311203) 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 11 ways as a sum of consecutive naturals, for example, 1578269 + ... + 1653468.

It is an arithmetic number, because the mean of its divisors is an integer number (4207722876).

Almost surely, 2^121513311200 is an apocalyptic number.

121513311200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121513311200 is an abundant number, since it is smaller than the sum of its proper divisors (181442735872).

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

121513311200 is a wasteful number, since it uses less digits than its factorization.

121513311200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3231804 (or 3231791 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 20.

Adding to 121513311200 its reverse (2113315121), we get a palindrome (123626626321).

The spelling of 121513311200 in words is "one hundred twenty-one billion, five hundred thirteen million, three hundred eleven thousand, two hundred".