123122121209 has 2 divisors, whose sum is σ = 123122121210. Its totient is φ = 123122121208.

The previous prime is 123122121191. The next prime is 123122121259. The reversal of 123122121209 is 902121221321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 119420007184 + 3702114025 = 345572^2 + 60845^2 .

It is a cyclic number.

It is not a de Polignac number, because 123122121209 - 2³⁶ = 54402644473 is a prime.

It is not a weakly prime, because it can be changed into another prime (123122121259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61561060604 + 61561060605.

It is an arithmetic number, because the mean of its divisors is an integer number (61561060605).

Almost surely, 2^123122121209 is an apocalyptic number.

It is an amenable number.

123122121209 is a deficient number, since it is larger than the sum of its proper divisors (1).

123122121209 is an equidigital number, since it uses as much as digits as its factorization.

123122121209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 26.

The spelling of 123122121209 in words is "one hundred twenty-three billion, one hundred twenty-two million, one hundred twenty-one thousand, two hundred nine".