11113241221 has 4 divisors (see below), whose sum is σ = 11118693600. Its totient is φ = 11107788844.

The previous prime is 11113241201. The next prime is 11113241233. The reversal of 11113241221 is 12214231111.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11113241221 is a prime.

It is a super-2 number, since 2×11113241221² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11113241201) 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, 2723131 + ... + 2727208.

It is an arithmetic number, because the mean of its divisors is an integer number (2779673400).

Almost surely, 2^11113241221 is an apocalyptic number.

It is an amenable number.

11113241221 is a deficient number, since it is larger than the sum of its proper divisors (5452379).

11113241221 is an equidigital number, since it uses as much as digits as its factorization.

11113241221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5452378.

The product of its digits is 96, while the sum is 19.

Adding to 11113241221 its reverse (12214231111), we get a palindrome (23327472332).

The spelling of 11113241221 in words is "eleven billion, one hundred thirteen million, two hundred forty-one thousand, two hundred twenty-one".