11115221155 has 16 divisors (see below), whose sum is σ = 14257664064. Its totient is φ = 8298104320.

The previous prime is 11115221111. The next prime is 11115221177. The reversal of 11115221155 is 55112251111.

It is a de Polignac number, because none of the positive numbers 2^k-11115221155 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1173994 + ... + 1183423.

It is an arithmetic number, because the mean of its divisors is an integer number (891104004).

Almost surely, 2^11115221155 is an apocalyptic number.

11115221155 is a deficient number, since it is larger than the sum of its proper divisors (3142442909).

11115221155 is a wasteful number, since it uses less digits than its factorization.

11115221155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2357486.

The product of its digits is 500, while the sum is 25.

Adding to 11115221155 its reverse (55112251111), we get a palindrome (66227472266).

The spelling of 11115221155 in words is "eleven billion, one hundred fifteen million, two hundred twenty-one thousand, one hundred fifty-five".