221853 has 4 divisors (see below), whose sum is σ = 295808. Its totient is φ = 147900.

The previous prime is 221849. The next prime is 221873. The reversal of 221853 is 358122.

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 not a de Polignac number, because 221853 - 2² = 221849 is a prime.

It is a D-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 (221813) 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, 36973 + ... + 36978.

It is an arithmetic number, because the mean of its divisors is an integer number (73952).

2²²¹⁸⁵³ is an apocalyptic number.

It is an amenable number.

221853 is a deficient number, since it is larger than the sum of its proper divisors (73955).

221853 is an equidigital number, since it uses as much as digits as its factorization.

221853 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73954.

The product of its digits is 480, while the sum is 21.

The square root of 221853 is about 471.0127386812. The cubic root of 221853 is about 60.5371217665.

Adding to 221853 its reverse (358122), we get a palindrome (579975).

The spelling of 221853 in words is "two hundred twenty-one thousand, eight hundred fifty-three".