11221121121 has 32 divisors (see below), whose sum is σ = 17580896256. Its totient is φ = 6232464000.

The previous prime is 11221121111. The next prime is 11221121123. The reversal of 11221121121 is 12112112211.

It is a happy number.

It is not a de Polignac number, because 11221121121 - 2¹⁹ = 11220596833 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 11221121121.

It is not an unprimeable number, because it can be changed into a prime (11221121123) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 209286 + ... + 257376.

It is an arithmetic number, because the mean of its divisors is an integer number (549403008).

Almost surely, 2^11221121121 is an apocalyptic number.

It is an amenable number.

11221121121 is a deficient number, since it is larger than the sum of its proper divisors (6359775135).

11221121121 is a wasteful number, since it uses less digits than its factorization.

11221121121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48413.

The product of its digits is 16, while the sum is 15.

Adding to 11221121121 its reverse (12112112211), we get a palindrome (23333233332).

The spelling of 11221121121 in words is "eleven billion, two hundred twenty-one million, one hundred twenty-one thousand, one hundred twenty-one".