221923 has 8 divisors (see below), whose sum is σ = 245168. Its totient is φ = 199584.

The previous prime is 221909. The next prime is 221941. The reversal of 221923 is 329122.

It is a happy number.

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 221923 - 2⁵ = 221891 is a prime.

It is a Duffinian number.

221923 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 221923.

It is not an unprimeable number, because it can be changed into a prime (221953) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 361 + ... + 757.

It is an arithmetic number, because the mean of its divisors is an integer number (30646).

2²²¹⁹²³ is an apocalyptic number.

221923 is a deficient number, since it is larger than the sum of its proper divisors (23245).

221923 is a wasteful number, since it uses less digits than its factorization.

221923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 453.

The product of its digits is 216, while the sum is 19.

The square root of 221923 is about 471.0870407897. The cubic root of 221923 is about 60.5434880735.

The spelling of 221923 in words is "two hundred twenty-one thousand, nine hundred twenty-three".