243331421 has 8 divisors (see below), whose sum is σ = 268847424. Its totient is φ = 219060160.

The previous prime is 243331409. The next prime is 243331441. The reversal of 243331421 is 124133342.

243331421 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 243331421 - 2⁶ = 243331357 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243331441) 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, 310775 + ... + 311556.

It is an arithmetic number, because the mean of its divisors is an integer number (33605928).

Almost surely, 2^243331421 is an apocalyptic number.

It is an amenable number.

243331421 is a deficient number, since it is larger than the sum of its proper divisors (25516003).

243331421 is a wasteful number, since it uses less digits than its factorization.

243331421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 622371.

The product of its digits is 1728, while the sum is 23.

The square root of 243331421 is about 15599.0839795162. The cubic root of 243331421 is about 624.3087149352.

Adding to 243331421 its reverse (124133342), we get a palindrome (367464763).

The spelling of 243331421 in words is "two hundred forty-three million, three hundred thirty-one thousand, four hundred twenty-one".