221473 has 8 divisors (see below), whose sum is σ = 262080. Its totient is φ = 183120.

The previous prime is 221471. The next prime is 221477. The reversal of 221473 is 374122.

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

It is not a de Polignac number, because 221473 - 2¹ = 221471 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221473.

It is not an unprimeable number, because it can be changed into a prime (221471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 343 + ... + 748.

It is an arithmetic number, because the mean of its divisors is an integer number (32760).

2²²¹⁴⁷³ is an apocalyptic number.

It is an amenable number.

221473 is a deficient number, since it is larger than the sum of its proper divisors (40607).

221473 is a wasteful number, since it uses less digits than its factorization.

221473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1127.

The product of its digits is 336, while the sum is 19.

The square root of 221473 is about 470.6091796810. The cubic root of 221473 is about 60.5025384268.

Adding to 221473 its reverse (374122), we get a palindrome (595595).

The spelling of 221473 in words is "two hundred twenty-one thousand, four hundred seventy-three", and thus it is an iban number.