121200210 has 24 divisors (see below), whose sum is σ = 315120780. Its totient is φ = 32320032.

The previous prime is 121200181. The next prime is 121200227. The reversal of 121200210 is 12002121.

It can be written as a sum of positive squares in 2 ways, for example, as 113230881 + 7969329 = 10641^2 + 2823^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 121200192 and 121200201.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 673245 + ... + 673424.

Almost surely, 2^121200210 is an apocalyptic number.

121200210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121200210 is an abundant number, since it is smaller than the sum of its proper divisors (193920570).

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

121200210 is a wasteful number, since it uses less digits than its factorization.

121200210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1346682 (or 1346679 counting only the distinct ones).

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

The square root of 121200210 is about 11009.0966931897. The cubic root of 121200210 is about 494.8813918455.

Adding to 121200210 its reverse (12002121), we get a palindrome (133202331).

The spelling of 121200210 in words is "one hundred twenty-one million, two hundred thousand, two hundred ten".