121023209 has 2 divisors, whose sum is σ = 121023210. Its totient is φ = 121023208.

The previous prime is 121023169. The next prime is 121023257. The reversal of 121023209 is 902320121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 108264025 + 12759184 = 10405^2 + 3572^2 .

It is a cyclic number.

It is not a de Polignac number, because 121023209 - 2²⁰ = 119974633 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (121023299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60511604 + 60511605.

It is an arithmetic number, because the mean of its divisors is an integer number (60511605).

Almost surely, 2^121023209 is an apocalyptic number.

It is an amenable number.

121023209 is a deficient number, since it is larger than the sum of its proper divisors (1).

121023209 is an equidigital number, since it uses as much as digits as its factorization.

121023209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 121023209 is about 11001.0549039626. The cubic root of 121023209 is about 494.6403659240.

The spelling of 121023209 in words is "one hundred twenty-one million, twenty-three thousand, two hundred nine".