221303023 has 4 divisors (see below), whose sum is σ = 221661160. Its totient is φ = 220944888.

The previous prime is 221303009. The next prime is 221303063. The reversal of 221303023 is 320303122.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221303023 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221302988 and 221303006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221303063) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 178140 + ... + 179377.

It is an arithmetic number, because the mean of its divisors is an integer number (55415290).

Almost surely, 2^221303023 is an apocalyptic number.

221303023 is a deficient number, since it is larger than the sum of its proper divisors (358137).

221303023 is an equidigital number, since it uses as much as digits as its factorization.

221303023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 358136.

The product of its (nonzero) digits is 216, while the sum is 16.

The square root of 221303023 is about 14876.2570225175. The cubic root of 221303023 is about 604.8705622051.

Adding to 221303023 its reverse (320303122), we get a palindrome (541606145).

Subtracting 221303023 from its reverse (320303122), we obtain a palindrome (99000099).

The spelling of 221303023 in words is "two hundred twenty-one million, three hundred three thousand, twenty-three".