221369 has 8 divisors (see below), whose sum is σ = 238080. Its totient is φ = 205200.

The previous prime is 221327. The next prime is 221393. The reversal of 221369 is 963122.

221369 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 221369 - 2¹⁶ = 155833 is a prime.

It is a super-2 number, since 2×221369² = 98008468322, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 15.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 221369.

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 7 ways as a sum of consecutive naturals, for example, 1064 + ... + 1254.

It is an arithmetic number, because the mean of its divisors is an integer number (29760).

2²²¹³⁶⁹ is an apocalyptic number.

It is an amenable number.

221369 is a deficient number, since it is larger than the sum of its proper divisors (16711).

221369 is a wasteful number, since it uses less digits than its factorization.

221369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271.

The product of its digits is 648, while the sum is 23.

The square root of 221369 is about 470.4986716241. The cubic root of 221369 is about 60.4930666189.

The spelling of 221369 in words is "two hundred twenty-one thousand, three hundred sixty-nine".