221022223 has 4 divisors (see below), whose sum is σ = 221324488. Its totient is φ = 220719960.

The previous prime is 221022211. The next prime is 221022229. The reversal of 221022223 is 322220122.

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

It is a cyclic number.

It is not a de Polignac number, because 221022223 - 2⁹ = 221021711 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221022197 and 221022206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221022229) 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, 150033 + ... + 151498.

It is an arithmetic number, because the mean of its divisors is an integer number (55331122).

Almost surely, 2^221022223 is an apocalyptic number.

221022223 is a deficient number, since it is larger than the sum of its proper divisors (302265).

221022223 is an equidigital number, since it uses as much as digits as its factorization.

221022223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 302264.

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 221022223 is about 14866.8161689045. The cubic root of 221022223 is about 604.6146242319.

Adding to 221022223 its reverse (322220122), we get a palindrome (543242345).

It can be divided in two parts, 2 and 21022223, that added together give a square (21022225 = 4585²).

The spelling of 221022223 in words is "two hundred twenty-one million, twenty-two thousand, two hundred twenty-three".