243444021 has 8 divisors (see below), whose sum is σ = 325856064. Its totient is φ = 161664000.

The previous prime is 243444001. The next prime is 243444059. The reversal of 243444021 is 120444342.

It is a happy number.

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

It is not a de Polignac number, because 243444021 - 2⁵ = 243443989 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 243443982 and 243444000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243444001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 157105 + ... + 158646.

It is an arithmetic number, because the mean of its divisors is an integer number (40732008).

Almost surely, 2^243444021 is an apocalyptic number.

It is an amenable number.

243444021 is a deficient number, since it is larger than the sum of its proper divisors (82412043).

243444021 is a wasteful number, since it uses less digits than its factorization.

243444021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 316011.

The product of its (nonzero) digits is 3072, while the sum is 24.

The square root of 243444021 is about 15602.6927483688. The cubic root of 243444021 is about 624.4049983232.

Adding to 243444021 its reverse (120444342), we get a palindrome (363888363).

The spelling of 243444021 in words is "two hundred forty-three million, four hundred forty-four thousand, twenty-one".