11209121 has 16 divisors (see below), whose sum is σ = 14083200. Its totient is φ = 8666880.

The previous prime is 11209097. The next prime is 11209123. The reversal of 11209121 is 12190211.

It is a cyclic number.

It is not a de Polignac number, because 11209121 - 2¹⁰ = 11208097 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 11209121.

It is not an unprimeable number, because it can be changed into a prime (11209123) 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, 10985 + ... + 11961.

It is an arithmetic number, because the mean of its divisors is an integer number (880200).

Almost surely, 2^11209121 is an apocalyptic number.

11209121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11209121 is a deficient number, since it is larger than the sum of its proper divisors (2874079).

11209121 is a wasteful number, since it uses less digits than its factorization.

11209121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1144.

The product of its (nonzero) digits is 36, while the sum is 17.

The square root of 11209121 is about 3348.0025388282. The cubic root of 11209121 is about 223.7985074237.

Subtracting from 11209121 its sum of digits (17), we obtain a square (11209104 = 3348²).

Adding to 11209121 its reverse (12190211), we get a palindrome (23399332).

The spelling of 11209121 in words is "eleven million, two hundred nine thousand, one hundred twenty-one".