221859 has 24 divisors (see below), whose sum is σ = 366912. Its totient is φ = 132840.

The previous prime is 221849. The next prime is 221873. The reversal of 221859 is 958122.

221859 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 221859 - 2⁵ = 221827 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (221849) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2632 + ... + 2714.

It is an arithmetic number, because the mean of its divisors is an integer number (15288).

2²²¹⁸⁵⁹ is an apocalyptic number.

221859 is a deficient number, since it is larger than the sum of its proper divisors (145053).

221859 is an equidigital number, since it uses as much as digits as its factorization.

221859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109 (or 97 counting only the distinct ones).

The product of its digits is 1440, while the sum is 27.

The square root of 221859 is about 471.0191078927. The cubic root of 221859 is about 60.5376675024.

It can be divided in two parts, 22 and 1859, that added together give a palindrome (1881).

The spelling of 221859 in words is "two hundred twenty-one thousand, eight hundred fifty-nine".