121220210 has 8 divisors (see below), whose sum is σ = 218196396. Its totient is φ = 48488080.

The previous prime is 121220201. The next prime is 121220213. The reversal of 121220210 is 12022121.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 113273449 + 7946761 = 10643^2 + 2819^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 121220191 and 121220200.

It is not an unprimeable number, because it can be changed into a prime (121220213) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6061001 + ... + 6061020.

Almost surely, 2^121220210 is an apocalyptic number.

121220210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121220210 is a deficient number, since it is larger than the sum of its proper divisors (96976186).

121220210 is a wasteful number, since it uses less digits than its factorization.

121220210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12122028.

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

The square root of 121220210 is about 11010.0049954575. The cubic root of 121220210 is about 494.9086114999.

Adding to 121220210 its reverse (12022121), we get a palindrome (133242331).

The spelling of 121220210 in words is "one hundred twenty-one million, two hundred twenty thousand, two hundred ten".