121235404550209 has 2 divisors, whose sum is σ = 121235404550210. Its totient is φ = 121235404550208.

The previous prime is 121235404550177. The next prime is 121235404550233. The reversal of 121235404550209 is 902055404532121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 94605191310400 + 26630213239809 = 9726520^2 + 5160447^2 .

It is a cyclic number.

It is not a de Polignac number, because 121235404550209 - 2⁵ = 121235404550177 is a prime.

It is not a weakly prime, because it can be changed into another prime (121235404530209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60617702275104 + 60617702275105.

It is an arithmetic number, because the mean of its divisors is an integer number (60617702275105).

Almost surely, 2^{121235404550209} is an apocalyptic number.

It is an amenable number.

121235404550209 is a deficient number, since it is larger than the sum of its proper divisors (1).

121235404550209 is an equidigital number, since it uses as much as digits as its factorization.

121235404550209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432000, while the sum is 43.

The spelling of 121235404550209 in words is "one hundred twenty-one trillion, two hundred thirty-five billion, four hundred four million, five hundred fifty thousand, two hundred nine".