264221 has 2 divisors, whose sum is σ = 264222. Its totient is φ = 264220.

The previous prime is 264211. The next prime is 264263. The reversal of 264221 is 122462.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 264196 + 25 = 514^2 + 5^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-264221 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 264221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (264211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132110 + 132111.

It is an arithmetic number, because the mean of its divisors is an integer number (132111).

2²⁶⁴²²¹ is an apocalyptic number.

It is an amenable number.

264221 is a deficient number, since it is larger than the sum of its proper divisors (1).

264221 is an equidigital number, since it uses as much as digits as its factorization.

264221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 192, while the sum is 17.

The square root of 264221 is about 514.0243184909. The cubic root of 264221 is about 64.1685822407.

Adding to 264221 its reverse (122462), we get a palindrome (386683).

It can be divided in two parts, 26 and 4221, that multiplied together give a triangular number (109746 = T₄₆₈).

The spelling of 264221 in words is "two hundred sixty-four thousand, two hundred twenty-one".