221343 has 8 divisors (see below), whose sum is σ = 298800. Its totient is φ = 145728.

The previous prime is 221327. The next prime is 221393. The reversal of 221343 is 343122.

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

It is not a de Polignac number, because 221343 - 2⁴ = 221327 is a prime.

221343 is a lucky number.

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 221343.

It is not an unprimeable number, because it can be changed into a prime (221303) 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, 148 + ... + 681.

It is an arithmetic number, because the mean of its divisors is an integer number (37350).

2²²¹³⁴³ is an apocalyptic number.

221343 is a deficient number, since it is larger than the sum of its proper divisors (77457).

221343 is an equidigital number, since it uses as much as digits as its factorization.

221343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 921.

The product of its digits is 144, while the sum is 15.

The square root of 221343 is about 470.4710405540. The cubic root of 221343 is about 60.4906982034.

Adding to 221343 its reverse (343122), we get a palindrome (564465).

It can be divided in two parts, 2213 and 43, that multiplied together give a palindrome (95159).

The spelling of 221343 in words is "two hundred twenty-one thousand, three hundred forty-three", and thus it is an iban number.