221349 has 4 divisors (see below), whose sum is σ = 295136. Its totient is φ = 147564.

The previous prime is 221327. The next prime is 221393. The reversal of 221349 is 943122.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 221349 - 2⁵ = 221317 is a prime.

It is a D-number.

It is a Duffinian number.

It is a Curzon number.

It is a plaindrome in base 13.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 221349.

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, 36889 + ... + 36894.

It is an arithmetic number, because the mean of its divisors is an integer number (73784).

2²²¹³⁴⁹ is an apocalyptic number.

It is an amenable number.

221349 is a deficient number, since it is larger than the sum of its proper divisors (73787).

221349 is an equidigital number, since it uses as much as digits as its factorization.

221349 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73786.

The product of its digits is 432, while the sum is 21.

The square root of 221349 is about 470.4774170988. The cubic root of 221349 is about 60.4912447773.

The spelling of 221349 in words is "two hundred twenty-one thousand, three hundred forty-nine".