243005421 has 8 divisors (see below), whose sum is σ = 341060320. Its totient is φ = 153477072.

The previous prime is 243005417. The next prime is 243005423. The reversal of 243005421 is 124500342.

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

It is not a de Polignac number, because 243005421 - 2² = 243005417 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243005423) 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, 2131570 + ... + 2131683.

It is an arithmetic number, because the mean of its divisors is an integer number (42632540).

Almost surely, 2^243005421 is an apocalyptic number.

It is an amenable number.

243005421 is a deficient number, since it is larger than the sum of its proper divisors (98054899).

243005421 is a wasteful number, since it uses less digits than its factorization.

243005421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4263275.

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 243005421 is about 15588.6311458062. The cubic root of 243005421 is about 624.0297872656.

Adding to 243005421 its reverse (124500342), we get a palindrome (367505763).

The spelling of 243005421 in words is "two hundred forty-three million, five thousand, four hundred twenty-one".