221293 has 6 divisors (see below), whose sum is σ = 233934. Its totient is φ = 209304.

The previous prime is 221281. The next prime is 221303. The reversal of 221293 is 392122.

It is a happy number.

221293 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 116964 + 104329 = 342^2 + 323^2 .

It is not a de Polignac number, because 221293 - 2⁵ = 221261 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

221293 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 221293.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221203) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 55 + ... + 667.

It is an arithmetic number, because the mean of its divisors is an integer number (38989).

2²²¹²⁹³ is an apocalyptic number.

It is an amenable number.

221293 is a deficient number, since it is larger than the sum of its proper divisors (12641).

221293 is an equidigital number, since it uses as much as digits as its factorization.

221293 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 651 (or 632 counting only the distinct ones).

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

The square root of 221293 is about 470.4178993193. The cubic root of 221293 is about 60.4861430368.

The spelling of 221293 in words is "two hundred twenty-one thousand, two hundred ninety-three".