11211121001209 has 16 divisors (see below), whose sum is σ = 11386301533632. Its totient is φ = 11037256017408.

The previous prime is 11211121001191. The next prime is 11211121001257. The reversal of 11211121001209 is 90210012111211.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 11211121001209 - 2⁹ = 11211121000697 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11211121001209.

It is not an unprimeable number, because it can be changed into a prime (11211121001299) 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, 288681457 + ... + 288720289.

It is an arithmetic number, because the mean of its divisors is an integer number (711643845852).

Almost surely, 2^{11211121001209} is an apocalyptic number.

It is an amenable number.

11211121001209 is a deficient number, since it is larger than the sum of its proper divisors (175180532423).

11211121001209 is a wasteful number, since it uses less digits than its factorization.

11211121001209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55656.

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

The spelling of 11211121001209 in words is "eleven trillion, two hundred eleven billion, one hundred twenty-one million, one thousand, two hundred nine".