121111221200 has 60 divisors (see below), whose sum is σ = 306283923360. Its totient is φ = 45894775680.

The previous prime is 121111221191. The next prime is 121111221221. The reversal of 121111221200 is 2122111121.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7960244 + ... + 7975443.

It is an arithmetic number, because the mean of its divisors is an integer number (5104732056).

Almost surely, 2^121111221200 is an apocalyptic number.

121111221200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121111221200 is an abundant number, since it is smaller than the sum of its proper divisors (185172702160).

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

121111221200 is a wasteful number, since it uses less digits than its factorization.

121111221200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15935724 (or 15935713 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 121111221200 its reverse (2122111121), we get a palindrome (123233332321).

The spelling of 121111221200 in words is "one hundred twenty-one billion, one hundred eleven million, two hundred twenty-one thousand, two hundred".