121212200 has 48 divisors (see below), whose sum is σ = 282824160. Its totient is φ = 48312000.

The previous prime is 121212181. The next prime is 121212209. The reversal of 121212200 is 2212121.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121212209) 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 11 ways as a sum of consecutive naturals, for example, 65285 + ... + 67115.

It is an arithmetic number, because the mean of its divisors is an integer number (5892170).

Almost surely, 2^121212200 is an apocalyptic number.

121212200 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 121212200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (141412080).

121212200 is an abundant number, since it is smaller than the sum of its proper divisors (161611960).

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

121212200 is a wasteful number, since it uses less digits than its factorization.

121212200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2178 (or 2169 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 121212200 is about 11009.6412293953. The cubic root of 121212200 is about 494.8977103877.

Adding to 121212200 its reverse (2212121), we get a palindrome (123424321).

The spelling of 121212200 in words is "one hundred twenty-one million, two hundred twelve thousand, two hundred".