332821 has 4 divisors (see below), whose sum is σ = 334444. Its totient is φ = 331200.

The previous prime is 332803. The next prime is 332837. The reversal of 332821 is 128233.

It is a happy number.

332821 is nontrivially palindromic in base 16.

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 202500 + 130321 = 450^2 + 361^2 .

It is a cyclic number.

It is not a de Polignac number, because 332821 - 2⁹ = 332309 is a prime.

It is a super-2 number, since 2×332821² = 221539636082, which contains 22 as substring.

It is a Duffinian number.

332821 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (332851) 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, 450 + ... + 931.

It is an arithmetic number, because the mean of its divisors is an integer number (83611).

2³³²⁸²¹ is an apocalyptic number.

It is an amenable number.

332821 is a deficient number, since it is larger than the sum of its proper divisors (1623).

332821 is a wasteful number, since it uses less digits than its factorization.

332821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1622.

The product of its digits is 288, while the sum is 19.

The square root of 332821 is about 576.9064048873. The cubic root of 332821 is about 69.3005860105.

The spelling of 332821 in words is "three hundred thirty-two thousand, eight hundred twenty-one".