243021423 has 16 divisors (see below), whose sum is σ = 334008576. Its totient is φ = 157080000.

The previous prime is 243021403. The next prime is 243021451. The reversal of 243021423 is 324120342.

It is not a de Polignac number, because 243021423 - 2¹³ = 243013231 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 243021423.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243021403) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10798 + ... + 24548.

It is an arithmetic number, because the mean of its divisors is an integer number (20875536).

Almost surely, 2^243021423 is an apocalyptic number.

243021423 is a deficient number, since it is larger than the sum of its proper divisors (90987153).

243021423 is a wasteful number, since it uses less digits than its factorization.

243021423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13934.

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

The square root of 243021423 is about 15589.1443960212. The cubic root of 243021423 is about 624.0434844984.

Adding to 243021423 its reverse (324120342), we get a palindrome (567141765).

The spelling of 243021423 in words is "two hundred forty-three million, twenty-one thousand, four hundred twenty-three".