201122121209 has 4 divisors (see below), whose sum is σ = 202175116800. Its totient is φ = 200069125620.

The previous prime is 201122121199. The next prime is 201122121217. The reversal of 201122121209 is 902121221102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-201122121209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201122121229) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 526497509 + ... + 526497890.

It is an arithmetic number, because the mean of its divisors is an integer number (50543779200).

Almost surely, 2^201122121209 is an apocalyptic number.

It is an amenable number.

201122121209 is a deficient number, since it is larger than the sum of its proper divisors (1052995591).

201122121209 is a wasteful number, since it uses less digits than its factorization.

201122121209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1052995590.

The product of its (nonzero) digits is 288, while the sum is 23.

The spelling of 201122121209 in words is "two hundred one billion, one hundred twenty-two million, one hundred twenty-one thousand, two hundred nine".