221373 has 12 divisors (see below), whose sum is σ = 331968. Its totient is φ = 147420.

The previous prime is 221327. The next prime is 221393. The reversal of 221373 is 373122.

It is not a de Polignac number, because 221373 - 2⁹ = 220861 is a prime.

It is a Curzon number.

It is a congruent number.

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 11 ways as a sum of consecutive naturals, for example, 213 + ... + 698.

It is an arithmetic number, because the mean of its divisors is an integer number (27664).

2²²¹³⁷³ is an apocalyptic number.

It is an amenable number.

221373 is a deficient number, since it is larger than the sum of its proper divisors (110595).

221373 is an frugal number, since it uses more digits than its factorization.

221373 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 926 (or 914 counting only the distinct ones).

The product of its digits is 252, while the sum is 18.

The square root of 221373 is about 470.5029224139. The cubic root of 221373 is about 60.4934309740.

Adding to 221373 its reverse (373122), we get a palindrome (594495).

The spelling of 221373 in words is "two hundred twenty-one thousand, three hundred seventy-three", and thus it is an iban number.