221339 has 4 divisors (see below), whose sum is σ = 222600. Its totient is φ = 220080.

The previous prime is 221327. The next prime is 221393. The reversal of 221339 is 933122.

221339 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: 933122 = 2 ⋅466561.

It is a cyclic number.

It is not a de Polignac number, because 221339 - 2⁸ = 221083 is a prime.

It is a Duffinian number.

It is a plaindrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 221339.

It is not an unprimeable number, because it can be changed into a prime (221399) 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, 314 + ... + 735.

It is an arithmetic number, because the mean of its divisors is an integer number (55650).

2²²¹³³⁹ is an apocalyptic number.

221339 is a deficient number, since it is larger than the sum of its proper divisors (1261).

221339 is a wasteful number, since it uses less digits than its factorization.

221339 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1260.

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

The square root of 221339 is about 470.4667894762. The cubic root of 221339 is about 60.4903338153.

The spelling of 221339 in words is "two hundred twenty-one thousand, three hundred thirty-nine".