221043 has 4 divisors (see below), whose sum is σ = 294728. Its totient is φ = 147360.

The previous prime is 221021. The next prime is 221047. The reversal of 221043 is 340122.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 221043 - 2¹⁰ = 220019 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36838 + ... + 36843.

It is an arithmetic number, because the mean of its divisors is an integer number (73682).

2²²¹⁰⁴³ is an apocalyptic number.

221043 is a deficient number, since it is larger than the sum of its proper divisors (73685).

221043 is an equidigital number, since it uses as much as digits as its factorization.

221043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73684.

The product of its (nonzero) digits is 48, while the sum is 12.

The square root of 221043 is about 470.1521030475. The cubic root of 221043 is about 60.4633569061.

Adding to 221043 its reverse (340122), we get a palindrome (561165).

The spelling of 221043 in words is "two hundred twenty-one thousand, forty-three", and thus it is an iban number.