121221842400 has 108 divisors (see below), whose sum is σ = 427458547152. Its totient is φ = 32325822720.

The previous prime is 121221842393. The next prime is 121221842419. The reversal of 121221842400 is 4248122121.

121221842400 is a `hidden beast` number, since 1 + 2 + 1 + 2 + 218 + 42 + 400 = 666.

121221842400 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 8410984 + ... + 8425383.

Almost surely, 2^121221842400 is an apocalyptic number.

121221842400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121221842400 is an abundant number, since it is smaller than the sum of its proper divisors (306236704752).

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

121221842400 is a wasteful number, since it uses less digits than its factorization.

121221842400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16836393 (or 16836377 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 27.

Adding to 121221842400 its reverse (4248122121), we get a palindrome (125469964521).

The spelling of 121221842400 in words is "one hundred twenty-one billion, two hundred twenty-one million, eight hundred forty-two thousand, four hundred".