264421 has 4 divisors (see below), whose sum is σ = 265644. Its totient is φ = 263200.

The previous prime is 264403. The next prime is 264437. The reversal of 264421 is 124462.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 171396 + 93025 = 414^2 + 305^2 .

It is a cyclic number.

It is not a de Polignac number, because 264421 - 2⁹ = 263909 is a prime.

It is a d-powerful number, because it can be written as 2⁷ + 6² + 4³ + 4⁹ + 2¹¹ + 1 .

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (264221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 190 + ... + 751.

It is an arithmetic number, because the mean of its divisors is an integer number (66411).

2²⁶⁴⁴²¹ is an apocalyptic number.

It is an amenable number.

264421 is a deficient number, since it is larger than the sum of its proper divisors (1223).

264421 is an equidigital number, since it uses as much as digits as its factorization.

264421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1222.

The product of its digits is 384, while the sum is 19.

The square root of 264421 is about 514.2188250152. The cubic root of 264421 is about 64.1847687913.

Adding to 264421 its reverse (124462), we get a palindrome (388883).

The spelling of 264421 in words is "two hundred sixty-four thousand, four hundred twenty-one".