121221201121200 has 120 divisors (see below), whose sum is σ = 431457682547600. Its totient is φ = 32325653629440.

The previous prime is 121221201121193. The next prime is 121221201121219. The reversal of 121221201121200 is 2121102122121.

121221201121200 is a `hidden beast` number, since 1 + 21 + 221 + 201 + 1 + 21 + 200 = 666.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

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, 5612081845 + ... + 5612103444.

Almost surely, 2^{121221201121200} is an apocalyptic number.

121221201121200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121221201121200 is an abundant number, since it is smaller than the sum of its proper divisors (310236481426400).

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

121221201121200 is a wasteful number, since it uses less digits than its factorization.

121221201121200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11224185316 (or 11224185299 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 121221201121200 its reverse (2121102122121), we get a palindrome (123342303243321).

The spelling of 121221201121200 in words is "one hundred twenty-one trillion, two hundred twenty-one billion, two hundred one million, one hundred twenty-one thousand, two hundred".