221223023 has 16 divisors (see below), whose sum is σ = 281790720. Its totient is φ = 169070976.

The previous prime is 221223001. The next prime is 221223029. The reversal of 221223023 is 320322122.

It is a cyclic number.

It is not a de Polignac number, because 221223023 - 2⁸ = 221222767 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221222992 and 221223010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221223029) 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, 46661 + ... + 51182.

It is an arithmetic number, because the mean of its divisors is an integer number (17611920).

Almost surely, 2^221223023 is an apocalyptic number.

221223023 is a deficient number, since it is larger than the sum of its proper divisors (60567697).

221223023 is a wasteful number, since it uses less digits than its factorization.

221223023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97886.

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 221223023 is about 14873.5679310648. The cubic root of 221223023 is about 604.7976674681.

Adding to 221223023 its reverse (320322122), we get a palindrome (541545145).

Subtracting 221223023 from its reverse (320322122), we obtain a palindrome (99099099).

The spelling of 221223023 in words is "two hundred twenty-one million, two hundred twenty-three thousand, twenty-three".