221395 has 4 divisors (see below), whose sum is σ = 265680. Its totient is φ = 177112.

The previous prime is 221393. The next prime is 221399. The reversal of 221395 is 593122.

221395 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 593122 = 2 ⋅296561.

It is a cyclic number.

It is not a de Polignac number, because 221395 - 2¹ = 221393 is a prime.

221395 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (221393) 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, 22135 + ... + 22144.

It is an arithmetic number, because the mean of its divisors is an integer number (66420).

2²²¹³⁹⁵ is an apocalyptic number.

221395 is a deficient number, since it is larger than the sum of its proper divisors (44285).

221395 is an equidigital number, since it uses as much as digits as its factorization.

221395 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44284.

The product of its digits is 540, while the sum is 22.

The square root of 221395 is about 470.5263010715. The cubic root of 221395 is about 60.4954348489.

It can be divided in two parts, 221 and 395, that added together give a palindrome (616).

The spelling of 221395 in words is "two hundred twenty-one thousand, three hundred ninety-five".