11211011201209 has 4 divisors (see below), whose sum is σ = 11211063730804. Its totient is φ = 11210958671616.

The previous prime is 11211011201171. The next prime is 11211011201219. The reversal of 11211011201209 is 90210211011211.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3460355201209 + 7750656000000 = 1860203^2 + 2784000^2 .

It is a cyclic number.

It is not a de Polignac number, because 11211011201209 - 2³⁵ = 11176651462841 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 11211011201209.

It is not an unprimeable number, because it can be changed into a prime (11211011201219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25943352 + ... + 26371945.

It is an arithmetic number, because the mean of its divisors is an integer number (2802765932701).

Almost surely, 2^{11211011201209} is an apocalyptic number.

It is an amenable number.

11211011201209 is a deficient number, since it is larger than the sum of its proper divisors (52529595).

11211011201209 is an equidigital number, since it uses as much as digits as its factorization.

11211011201209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52529594.

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

The spelling of 11211011201209 in words is "eleven trillion, two hundred eleven billion, eleven million, two hundred one thousand, two hundred nine".