221239 has 2 divisors, whose sum is σ = 221240. Its totient is φ = 221238.

The previous prime is 221233. The next prime is 221251. The reversal of 221239 is 932122.

It is a happy number.

221239 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221239 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110619 + 110620.

It is an arithmetic number, because the mean of its divisors is an integer number (110620).

2²²¹²³⁹ is an apocalyptic number.

221239 is a deficient number, since it is larger than the sum of its proper divisors (1).

221239 is an equidigital number, since it uses as much as digits as its factorization.

221239 is an odious number, because the sum of its binary digits is odd.

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

The square root of 221239 is about 470.3605000423. The cubic root of 221239 is about 60.4812226862.

It can be divided in two parts, 2212 and 39, that multiplied together give a palindrome (86268).

The spelling of 221239 in words is "two hundred twenty-one thousand, two hundred thirty-nine".