221073 has 8 divisors (see below), whose sum is σ = 300000. Its totient is φ = 144768.

The previous prime is 221071. The next prime is 221077. The reversal of 221073 is 370122.

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

It is not a de Polignac number, because 221073 - 2¹ = 221071 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (221071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 448 + ... + 801.

It is an arithmetic number, because the mean of its divisors is an integer number (37500).

2²²¹⁰⁷³ is an apocalyptic number.

It is an amenable number.

221073 is a deficient number, since it is larger than the sum of its proper divisors (78927).

221073 is a wasteful number, since it uses less digits than its factorization.

221073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1311.

The product of its (nonzero) digits is 84, while the sum is 15.

The square root of 221073 is about 470.1840065336. The cubic root of 221073 is about 60.4660921486.

Adding to 221073 its reverse (370122), we get a palindrome (591195).

The spelling of 221073 in words is "two hundred twenty-one thousand, seventy-three", and thus it is an iban number.