243143021 has 8 divisors (see below), whose sum is σ = 272416224. Its totient is φ = 215064720.

The previous prime is 243142987. The next prime is 243143053. The reversal of 243143021 is 120341342.

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

It is a de Polignac number, because none of the positive numbers 2^k-243143021 is a prime.

It is a super-2 number, since 2×243143021² = 118237057322012882, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 243142984 and 243143002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243143081) 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, 298295 + ... + 299108.

It is an arithmetic number, because the mean of its divisors is an integer number (34052028).

Almost surely, 2^243143021 is an apocalyptic number.

It is an amenable number.

243143021 is a deficient number, since it is larger than the sum of its proper divisors (29273203).

243143021 is a wasteful number, since it uses less digits than its factorization.

243143021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 597451.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 243143021 is about 15593.0439940379. The cubic root of 243143021 is about 624.1475491059.

Adding to 243143021 its reverse (120341342), we get a palindrome (363484363).

The spelling of 243143021 in words is "two hundred forty-three million, one hundred forty-three thousand, twenty-one".