201211121209 has 16 divisors (see below), whose sum is σ = 242188441600. Its totient is φ = 163301765904.

The previous prime is 201211121179. The next prime is 201211121227. The reversal of 201211121209 is 902121112102.

It is a cyclic number.

It is not a de Polignac number, because 201211121209 - 2⁷ = 201211121081 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 201211121209.

It is not an unprimeable number, because it can be changed into a prime (201211121239) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 156849 + ... + 653470.

It is an arithmetic number, because the mean of its divisors is an integer number (15136777600).

Almost surely, 2^201211121209 is an apocalyptic number.

It is an amenable number.

201211121209 is a deficient number, since it is larger than the sum of its proper divisors (40977320391).

201211121209 is a wasteful number, since it uses less digits than its factorization.

201211121209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 812212.

The product of its (nonzero) digits is 144, while the sum is 22.

The spelling of 201211121209 in words is "two hundred one billion, two hundred eleven million, one hundred twenty-one thousand, two hundred nine".