243021 has 8 divisors (see below), whose sum is σ = 329760. Its totient is φ = 159152.

The previous prime is 243011. The next prime is 243031. The reversal of 243021 is 120342.

It is an interprime number because it is at equal distance from previous prime (243011) and next prime (243031).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 243021 - 2⁵ = 242989 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 242988 and 243006.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 243021.

It is not an unprimeable number, because it can be changed into a prime (243011) 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, 510 + ... + 863.

It is an arithmetic number, because the mean of its divisors is an integer number (41220).

2²⁴³⁰²¹ is an apocalyptic number.

It is an amenable number.

243021 is a deficient number, since it is larger than the sum of its proper divisors (86739).

243021 is a wasteful number, since it uses less digits than its factorization.

243021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1435.

The product of its (nonzero) digits is 48, while the sum is 12.

The square root of 243021 is about 492.9716016162. The cubic root of 243021 is about 62.4043122431.

Adding to 243021 its reverse (120342), we get a palindrome (363363).

The spelling of 243021 in words is "two hundred forty-three thousand, twenty-one", and thus it is an iban number.