121543200 has 288 divisors, whose sum is σ = 466845120. Its totient is φ = 30412800.

The previous prime is 121543199. The next prime is 121543207. The reversal of 121543200 is 2345121.

121543200 is a `hidden beast` number, since 121 + 543 + 2 + 0 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (288).

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

It is not an unprimeable number, because it can be changed into a prime (121543207) 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 47 ways as a sum of consecutive naturals, for example, 367035 + ... + 367365.

It is an arithmetic number, because the mean of its divisors is an integer number (1620990).

Almost surely, 2^121543200 is an apocalyptic number.

121543200 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 121543200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (233422560).

121543200 is an abundant number, since it is smaller than the sum of its proper divisors (345301920).

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

121543200 is a wasteful number, since it uses less digits than its factorization.

121543200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 377 (or 358 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 121543200 is about 11024.6632601636. The cubic root of 121543200 is about 495.3477813073.

Adding to 121543200 its reverse (2345121), we get a palindrome (123888321).

The spelling of 121543200 in words is "one hundred twenty-one million, five hundred forty-three thousand, two hundred".