201121001111209 has 2 divisors, whose sum is σ = 201121001111210. Its totient is φ = 201121001111208.

The previous prime is 201121001111189. The next prime is 201121001111263. The reversal of 201121001111209 is 902111100121102.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 194470611153984 + 6650389957225 = 13945272^2 + 2578835^2 .

It is a cyclic number.

It is not a de Polignac number, because 201121001111209 - 2²¹ = 201120999014057 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 201121001111209.

It is not a weakly prime, because it can be changed into another prime (201121001111309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100560500555604 + 100560500555605.

It is an arithmetic number, because the mean of its divisors is an integer number (100560500555605).

Almost surely, 2^{201121001111209} is an apocalyptic number.

It is an amenable number.

201121001111209 is a deficient number, since it is larger than the sum of its proper divisors (1).

201121001111209 is an equidigital number, since it uses as much as digits as its factorization.

201121001111209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 22.

The spelling of 201121001111209 in words is "two hundred one trillion, one hundred twenty-one billion, one million, one hundred eleven thousand, two hundred nine".