121210200 has 72 divisors (see below), whose sum is σ = 407070300. Its totient is φ = 32322240.

The previous prime is 121210183. The next prime is 121210213. The reversal of 121210200 is 2012121.

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a nialpdrome in base 15.

It is a congruent number.

It is an unprimeable number.

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 17 ways as a sum of consecutive naturals, for example, 31870 + ... + 35469.

Almost surely, 2^121210200 is an apocalyptic number.

121210200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121210200 is an abundant number, since it is smaller than the sum of its proper divisors (285860100).

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

121210200 is a wasteful number, since it uses less digits than its factorization.

121210200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67361 (or 67349 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 121210200 is about 11009.5503995395. The cubic root of 121210200 is about 494.8949884371.

Adding to 121210200 its reverse (2012121), we get a palindrome (123222321).

The spelling of 121210200 in words is "one hundred twenty-one million, two hundred ten thousand, two hundred".