243423021 has 8 divisors (see below), whose sum is σ = 327042144. Its totient is φ = 161042960.

The previous prime is 243422999. The next prime is 243423031. The reversal of 243423021 is 120324342.

243423021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 243423021 - 2¹¹ = 243420973 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243423031) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 309306 + ... + 310091.

It is an arithmetic number, because the mean of its divisors is an integer number (40880268).

Almost surely, 2^243423021 is an apocalyptic number.

It is an amenable number.

243423021 is a deficient number, since it is larger than the sum of its proper divisors (83619123).

243423021 is a wasteful number, since it uses less digits than its factorization.

243423021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 619531.

The product of its (nonzero) digits is 1152, while the sum is 21.

The square root of 243423021 is about 15602.0197730935. The cubic root of 243423021 is about 624.3870436384.

Adding to 243423021 its reverse (120324342), we get a palindrome (363747363).

The spelling of 243423021 in words is "two hundred forty-three million, four hundred twenty-three thousand, twenty-one".