11115144221 has 8 divisors (see below), whose sum is σ = 11770262784. Its totient is φ = 10460168640.

The previous prime is 11115144203. The next prime is 11115144241. The reversal of 11115144221 is 12244151111.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11115144221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11115144241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 152756 + ... + 213458.

It is an arithmetic number, because the mean of its divisors is an integer number (1471282848).

Almost surely, 2^11115144221 is an apocalyptic number.

It is an amenable number.

11115144221 is a deficient number, since it is larger than the sum of its proper divisors (655118563).

11115144221 is a wasteful number, since it uses less digits than its factorization.

11115144221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71491.

The product of its digits is 320, while the sum is 23.

Adding to 11115144221 its reverse (12244151111), we get a palindrome (23359295332).

The spelling of 11115144221 in words is "eleven billion, one hundred fifteen million, one hundred forty-four thousand, two hundred twenty-one".