243032021 has 8 divisors (see below), whose sum is σ = 262738080. Its totient is φ = 224017488.

The previous prime is 243031979. The next prime is 243032047. The reversal of 243032021 is 120230342.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243032021 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243032071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 172151 + ... + 173556.

It is an arithmetic number, because the mean of its divisors is an integer number (32842260).

Almost surely, 2^243032021 is an apocalyptic number.

It is an amenable number.

243032021 is a deficient number, since it is larger than the sum of its proper divisors (19706059).

243032021 is a wasteful number, since it uses less digits than its factorization.

243032021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 345763.

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 243032021 is about 15589.4843083407. The cubic root of 243032021 is about 624.0525557381.

Adding to 243032021 its reverse (120230342), we get a palindrome (363262363).

The spelling of 243032021 in words is "two hundred forty-three million, thirty-two thousand, twenty-one".