121323209 has 4 divisors (see below), whose sum is σ = 138655104. Its totient is φ = 103991316.

The previous prime is 121323199. The next prime is 121323221. The reversal of 121323209 is 902323121.

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 121323209 - 2¹⁶ = 121257673 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (121323239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8665937 + ... + 8665950.

It is an arithmetic number, because the mean of its divisors is an integer number (34663776).

Almost surely, 2^121323209 is an apocalyptic number.

It is an amenable number.

121323209 is a deficient number, since it is larger than the sum of its proper divisors (17331895).

121323209 is an equidigital number, since it uses as much as digits as its factorization.

121323209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17331894.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 121323209 is about 11014.6815205888. The cubic root of 121323209 is about 495.0487439670.

The spelling of 121323209 in words is "one hundred twenty-one million, three hundred twenty-three thousand, two hundred nine".