221479 has 4 divisors (see below), whose sum is σ = 222640. Its totient is φ = 220320.

The previous prime is 221477. The next prime is 221489. The reversal of 221479 is 974122.

221479 is nontrivially palindromic in base 4 and base 15.

221479 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 a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 221479 - 2¹ = 221477 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221471) 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, 219 + ... + 700.

It is an arithmetic number, because the mean of its divisors is an integer number (55660).

2²²¹⁴⁷⁹ is an apocalyptic number.

221479 is a deficient number, since it is larger than the sum of its proper divisors (1161).

221479 is an equidigital number, since it uses as much as digits as its factorization.

221479 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1160.

The product of its digits is 1008, while the sum is 25.

The square root of 221479 is about 470.6155543541. The cubic root of 221479 is about 60.5030847868.

The spelling of 221479 in words is "two hundred twenty-one thousand, four hundred seventy-nine".