236221 has 4 divisors (see below), whose sum is σ = 240732. Its totient is φ = 231712.

The previous prime is 236219. The next prime is 236231. The reversal of 236221 is 122632.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 168100 + 68121 = 410^2 + 261^2 .

It is a cyclic number.

It is not a de Polignac number, because 236221 - 2¹ = 236219 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 236195 and 236204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (236231) 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, 2176 + ... + 2281.

It is an arithmetic number, because the mean of its divisors is an integer number (60183).

2²³⁶²²¹ is an apocalyptic number.

It is an amenable number.

236221 is a deficient number, since it is larger than the sum of its proper divisors (4511).

236221 is an equidigital number, since it uses as much as digits as its factorization.

236221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4510.

The product of its digits is 144, while the sum is 16.

The square root of 236221 is about 486.0257194841. The cubic root of 236221 is about 61.8167499275.

Adding to 236221 its reverse (122632), we get a palindrome (358853).

The spelling of 236221 in words is "two hundred thirty-six thousand, two hundred twenty-one".