221118823 has 8 divisors (see below), whose sum is σ = 229488480. Its totient is φ = 212798880.

The previous prime is 221118797. The next prime is 221118829. The reversal of 221118823 is 328811122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 221118823 - 2⁹ = 221118311 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221118791 and 221118800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221118829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3240 + ... + 21277.

It is an arithmetic number, because the mean of its divisors is an integer number (28686060).

Almost surely, 2^221118823 is an apocalyptic number.

221118823 is a deficient number, since it is larger than the sum of its proper divisors (8369657).

221118823 is a wasteful number, since it uses less digits than its factorization.

221118823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24857.

The product of its digits is 1536, while the sum is 28.

The square root of 221118823 is about 14870.0646602495. The cubic root of 221118823 is about 604.7026957163.

Adding to 221118823 its reverse (328811122), we get a palindrome (549929945).

The spelling of 221118823 in words is "two hundred twenty-one million, one hundred eighteen thousand, eight hundred twenty-three".