366221 has 2 divisors, whose sum is σ = 366222. Its totient is φ = 366220.

The previous prime is 366217. The next prime is 366227. The reversal of 366221 is 122663.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 366025 + 196 = 605^2 + 14^2 .

It is an emirp because it is prime and its reverse (122663) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 366221 - 2² = 366217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 366193 and 366202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (366227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 183110 + 183111.

It is an arithmetic number, because the mean of its divisors is an integer number (183111).

2³⁶⁶²²¹ is an apocalyptic number.

It is an amenable number.

366221 is a deficient number, since it is larger than the sum of its proper divisors (1).

366221 is an equidigital number, since it uses as much as digits as its factorization.

366221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 432, while the sum is 20.

The square root of 366221 is about 605.1619617920. The cubic root of 366221 is about 71.5452954389.

Adding to 366221 its reverse (122663), we get a palindrome (488884).

The spelling of 366221 in words is "three hundred sixty-six thousand, two hundred twenty-one".