243410021 has 8 divisors (see below), whose sum is σ = 252046080. Its totient is φ = 234790192.

The previous prime is 243410017. The next prime is 243410051. The reversal of 243410021 is 120014342.

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 243410021 - 2² = 243410017 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243410051) 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, 32036 + ... + 38898.

It is an arithmetic number, because the mean of its divisors is an integer number (31505760).

Almost surely, 2^243410021 is an apocalyptic number.

It is an amenable number.

243410021 is a deficient number, since it is larger than the sum of its proper divisors (8636059).

243410021 is a wasteful number, since it uses less digits than its factorization.

243410021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8115.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 243410021 is about 15601.6031548043. The cubic root of 243410021 is about 624.3759283160.

Adding to 243410021 its reverse (120014342), we get a palindrome (363424363).

The spelling of 243410021 in words is "two hundred forty-three million, four hundred ten thousand, twenty-one".