121020010100209 has 12 divisors (see below), whose sum is σ = 133097877290308. Its totient is φ = 109955430858240.

The previous prime is 121020010100183. The next prime is 121020010100239. The reversal of 121020010100209 is 902001010020121.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 19976904019809 + 101043106080400 = 4469553^2 + 10052020^2 .

It is not a de Polignac number, because 121020010100209 - 2⁹ = 121020010099697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121020010100239) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 285060384 + ... + 285484609.

Almost surely, 2^{121020010100209} is an apocalyptic number.

It is an amenable number.

121020010100209 is a deficient number, since it is larger than the sum of its proper divisors (12077867190099).

121020010100209 is a wasteful number, since it uses less digits than its factorization.

121020010100209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 570546768 (or 570546757 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 19.

The spelling of 121020010100209 in words is "one hundred twenty-one trillion, twenty billion, ten million, one hundred thousand, two hundred nine".