221933 has 4 divisors (see below), whose sum is σ = 227388. Its totient is φ = 216480.

The previous prime is 221909. The next prime is 221941. The reversal of 221933 is 339122.

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

It can be written as a sum of positive squares in 2 ways, for example, as 26569 + 195364 = 163^2 + 442^2 .

It is not a de Polignac number, because 221933 - 2⁸ = 221677 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 221933.

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

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2666 + ... + 2747.

It is an arithmetic number, because the mean of its divisors is an integer number (56847).

2²²¹⁹³³ is an apocalyptic number.

It is an amenable number.

221933 is a deficient number, since it is larger than the sum of its proper divisors (5455).

221933 is an equidigital number, since it uses as much as digits as its factorization.

221933 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5454.

The product of its digits is 324, while the sum is 20.

The square root of 221933 is about 471.0976544200. The cubic root of 221933 is about 60.5443974366.

The spelling of 221933 in words is "two hundred twenty-one thousand, nine hundred thirty-three".