11121232211 has 4 divisors (see below), whose sum is σ = 11177118000. Its totient is φ = 11065346424.

The previous prime is 11121232169. The next prime is 11121232223. The reversal of 11121232211 is 11223212111.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11121232211 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 11121232211.

It is not an unprimeable number, because it can be changed into a prime (11121232271) 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, 27942596 + ... + 27942993.

It is an arithmetic number, because the mean of its divisors is an integer number (2794279500).

Almost surely, 2^11121232211 is an apocalyptic number.

11121232211 is a deficient number, since it is larger than the sum of its proper divisors (55885789).

11121232211 is an equidigital number, since it uses as much as digits as its factorization.

11121232211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55885788.

The product of its digits is 48, while the sum is 17.

Adding to 11121232211 its reverse (11223212111), we get a palindrome (22344444322).

The spelling of 11121232211 in words is "eleven billion, one hundred twenty-one million, two hundred thirty-two thousand, two hundred eleven".