221115423 has 16 divisors (see below), whose sum is σ = 300418272. Its totient is φ = 144624000.

The previous prime is 221115341. The next prime is 221115437. The reversal of 221115423 is 324511122.

It is not a de Polignac number, because 221115423 - 2⁹ = 221114911 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221115423.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221115443) 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 15 ways as a sum of consecutive naturals, for example, 83053 + ... + 85673.

It is an arithmetic number, because the mean of its divisors is an integer number (18776142).

Almost surely, 2^221115423 is an apocalyptic number.

221115423 is a deficient number, since it is larger than the sum of its proper divisors (79302849).

221115423 is a wasteful number, since it uses less digits than its factorization.

221115423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3146.

The product of its digits is 480, while the sum is 21.

The square root of 221115423 is about 14869.9503361645. The cubic root of 221115423 is about 604.6995963274.

Adding to 221115423 its reverse (324511122), we get a palindrome (545626545).

The spelling of 221115423 in words is "two hundred twenty-one million, one hundred fifteen thousand, four hundred twenty-three".