121210009 has 4 divisors (see below), whose sum is σ = 121410304. Its totient is φ = 121009716.

The previous prime is 121210007. The next prime is 121210021. The reversal of 121210009 is 900012121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 121210009 - 2¹ = 121210007 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121209974 and 121210001.

It is not an unprimeable number, because it can be changed into a prime (121210007) 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 3 ways as a sum of consecutive naturals, for example, 99237 + ... + 100450.

It is an arithmetic number, because the mean of its divisors is an integer number (30352576).

Almost surely, 2^121210009 is an apocalyptic number.

It is an amenable number.

121210009 is a deficient number, since it is larger than the sum of its proper divisors (200295).

121210009 is an equidigital number, since it uses as much as digits as its factorization.

121210009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200294.

The product of its (nonzero) digits is 36, while the sum is 16.

The square root of 121210009 is about 11009.5417252491. The cubic root of 121210009 is about 494.8947284893.

The spelling of 121210009 in words is "one hundred twenty-one million, two hundred ten thousand, nine".