221113123 has 16 divisors (see below), whose sum is σ = 282401280. Its totient is φ = 168091200.

The previous prime is 221113121. The next prime is 221113129. The reversal of 221113123 is 321311122.

It is a cyclic number.

It is not a de Polignac number, because 221113123 - 2¹ = 221113121 is a prime.

It is a super-3 number, since 3×221113123³ (a number of 26 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 221113097 and 221113106.

It is not an unprimeable number, because it can be changed into a prime (221113121) 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, 31863 + ... + 38176.

It is an arithmetic number, because the mean of its divisors is an integer number (17650080).

Almost surely, 2^221113123 is an apocalyptic number.

221113123 is a deficient number, since it is larger than the sum of its proper divisors (61288157).

221113123 is a wasteful number, since it uses less digits than its factorization.

221113123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70098.

The product of its digits is 72, while the sum is 16.

The square root of 221113123 is about 14869.8729987852. The cubic root of 221113123 is about 604.6974996639.

Adding to 221113123 its reverse (321311122), we get a palindrome (542424245).

The spelling of 221113123 in words is "two hundred twenty-one million, one hundred thirteen thousand, one hundred twenty-three".