221113111 has 4 divisors (see below), whose sum is σ = 228245824. Its totient is φ = 213980400.

The previous prime is 221113091. The next prime is 221113121. The reversal of 221113111 is 111311122.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 221113111 - 2⁹ = 221112599 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221113091 and 221113100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221113121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3566310 + ... + 3566371.

It is an arithmetic number, because the mean of its divisors is an integer number (57061456).

Almost surely, 2^221113111 is an apocalyptic number.

221113111 is a deficient number, since it is larger than the sum of its proper divisors (7132713).

221113111 is an equidigital number, since it uses as much as digits as its factorization.

221113111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7132712.

The product of its digits is 12, while the sum is 13.

The square root of 221113111 is about 14869.8725952847. The cubic root of 221113111 is about 604.6974887248.

Adding to 221113111 its reverse (111311122), we get a palindrome (332424233).

It can be divided in two parts, 22 and 1113111, that multiplied together give a palindrome (24488442).

The spelling of 221113111 in words is "two hundred twenty-one million, one hundred thirteen thousand, one hundred eleven".