243201040021 has 8 divisors (see below), whose sum is σ = 244459555200. Its totient is φ = 241942889232.

The previous prime is 243201039971. The next prime is 243201040037. The reversal of 243201040021 is 120040102342.

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 243201040021 - 2³³ = 234611105429 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 (243201040091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1302111 + ... + 1477123.

It is an arithmetic number, because the mean of its divisors is an integer number (30557444400).

Almost surely, 2^243201040021 is an apocalyptic number.

It is an amenable number.

243201040021 is a deficient number, since it is larger than the sum of its proper divisors (1258515179).

243201040021 is a wasteful number, since it uses less digits than its factorization.

243201040021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182195.

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 243201040021 its reverse (120040102342), we get a palindrome (363241142363).

The spelling of 243201040021 in words is "two hundred forty-three billion, two hundred one million, forty thousand, twenty-one".