221893 has 4 divisors (see below), whose sum is σ = 253600. Its totient is φ = 190188.

The previous prime is 221891. The next prime is 221909. The reversal of 221893 is 398122.

221893 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 221893 - 2¹ = 221891 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221891) 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, 15843 + ... + 15856.

It is an arithmetic number, because the mean of its divisors is an integer number (63400).

2²²¹⁸⁹³ is an apocalyptic number.

It is an amenable number.

221893 is a deficient number, since it is larger than the sum of its proper divisors (31707).

221893 is an equidigital number, since it uses as much as digits as its factorization.

221893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31706.

The product of its digits is 864, while the sum is 25.

The square root of 221893 is about 471.0551984640. The cubic root of 221893 is about 60.5407598201.

The spelling of 221893 in words is "two hundred twenty-one thousand, eight hundred ninety-three".