11113223221 has 16 divisors (see below), whose sum is σ = 12040642224. Its totient is φ = 10217918464.

The previous prime is 11113223203. The next prime is 11113223227. The reversal of 11113223221 is 12232231111.

It can be written as a sum of positive squares in 8 ways, for example, as 501132996 + 10612090225 = 22386^2 + 103015^2 .

It is a cyclic number.

It is not a de Polignac number, because 11113223221 - 2⁵ = 11113223189 is a prime.

It is a super-2 number, since 2×11113223221² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11113223227) 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, 183465 + ... + 236401.

It is an arithmetic number, because the mean of its divisors is an integer number (752540139).

Almost surely, 2^11113223221 is an apocalyptic number.

It is an amenable number.

11113223221 is a deficient number, since it is larger than the sum of its proper divisors (927419003).

11113223221 is a wasteful number, since it uses less digits than its factorization.

11113223221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53240.

The product of its digits is 144, while the sum is 19.

Adding to 11113223221 its reverse (12232231111), we get a palindrome (23345454332).

The spelling of 11113223221 in words is "eleven billion, one hundred thirteen million, two hundred twenty-three thousand, two hundred twenty-one".