243323021 has 8 divisors (see below), whose sum is σ = 255981600. Its totient is φ = 230949040.

The previous prime is 243323011. The next prime is 243323027. The reversal of 243323021 is 120323342.

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

It is not a de Polignac number, because 243323021 - 2¹⁰ = 243321997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 243322984 and 243323002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243323027) 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, 69395 + ... + 72816.

It is an arithmetic number, because the mean of its divisors is an integer number (31997700).

Almost surely, 2^243323021 is an apocalyptic number.

It is an amenable number.

243323021 is a deficient number, since it is larger than the sum of its proper divisors (12658579).

243323021 is a wasteful number, since it uses less digits than its factorization.

243323021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142299.

The product of its (nonzero) digits is 864, while the sum is 20.

The square root of 243323021 is about 15598.8147306133. The cubic root of 243323021 is about 624.3015309697.

Adding to 243323021 its reverse (120323342), we get a palindrome (363646363).

The spelling of 243323021 in words is "two hundred forty-three million, three hundred twenty-three thousand, twenty-one".