221243 has 4 divisors (see below), whose sum is σ = 241368. Its totient is φ = 201120.

The previous prime is 221239. The next prime is 221251. The reversal of 221243 is 342122.

221243 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.

It is a cyclic number.

It is not a de Polignac number, because 221243 - 2² = 221239 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221203) 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, 10046 + ... + 10067.

It is an arithmetic number, because the mean of its divisors is an integer number (60342).

2²²¹²⁴³ is an apocalyptic number.

221243 is a deficient number, since it is larger than the sum of its proper divisors (20125).

221243 is a wasteful number, since it uses less digits than its factorization.

221243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20124.

The product of its digits is 96, while the sum is 14.

The square root of 221243 is about 470.3647520808. The cubic root of 221243 is about 60.4815871841.

Adding to 221243 its reverse (342122), we get a palindrome (563365).

It can be divided in two parts, 221 and 243, that added together give a palindrome (464).

The spelling of 221243 in words is "two hundred twenty-one thousand, two hundred forty-three", and thus it is an iban number.