243144421 has 16 divisors (see below), whose sum is σ = 279465984. Its totient is φ = 209551104.

The previous prime is 243144409. The next prime is 243144469. The reversal of 243144421 is 124441342.

It is a cyclic number.

It is not a de Polignac number, because 243144421 - 2²³ = 234755813 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 (243144401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23736 + ... + 32398.

It is an arithmetic number, because the mean of its divisors is an integer number (17466624).

Almost surely, 2^243144421 is an apocalyptic number.

It is an amenable number.

243144421 is a deficient number, since it is larger than the sum of its proper divisors (36321563).

243144421 is a wasteful number, since it uses less digits than its factorization.

243144421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8820.

The product of its digits is 3072, while the sum is 25.

The square root of 243144421 is about 15593.0888857853. The cubic root of 243144421 is about 624.1487470358.

Adding to 243144421 its reverse (124441342), we get a palindrome (367585763).

The spelling of 243144421 in words is "two hundred forty-three million, one hundred forty-four thousand, four hundred twenty-one".