232821 has 8 divisors (see below), whose sum is σ = 344960. Its totient is φ = 155196.

The previous prime is 232819. The next prime is 232823. The reversal of 232821 is 128232.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (232819) and next prime (232823).

It is not a de Polignac number, because 232821 - 2¹ = 232819 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 232794 and 232803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (232823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4285 + ... + 4338.

It is an arithmetic number, because the mean of its divisors is an integer number (43120).

2²³²⁸²¹ is an apocalyptic number.

It is an amenable number.

232821 is a deficient number, since it is larger than the sum of its proper divisors (112139).

232821 is an equidigital number, since it uses as much as digits as its factorization.

232821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8632 (or 8626 counting only the distinct ones).

The product of its digits is 192, while the sum is 18.

The square root of 232821 is about 482.5152847320. The cubic root of 232821 is about 61.5187331392.

It can be divided in two parts, 2 and 32821, that added together give a palindrome (32823).

The spelling of 232821 in words is "two hundred thirty-two thousand, eight hundred twenty-one".