243140231221 has 8 divisors (see below), whose sum is σ = 243662943744. Its totient is φ = 242617987920.

The previous prime is 243140231219. The next prime is 243140231233. The reversal of 243140231221 is 122132041342.

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 243140231221 - 2¹ = 243140231219 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 (243140231261) 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, 930180 + ... + 1162546.

It is an arithmetic number, because the mean of its divisors is an integer number (30457867968).

Almost surely, 2^243140231221 is an apocalyptic number.

It is an amenable number.

243140231221 is a deficient number, since it is larger than the sum of its proper divisors (522712523).

243140231221 is a wasteful number, since it uses less digits than its factorization.

243140231221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234611.

The product of its (nonzero) digits is 2304, while the sum is 25.

Adding to 243140231221 its reverse (122132041342), we get a palindrome (365272272563).

The spelling of 243140231221 in words is "two hundred forty-three billion, one hundred forty million, two hundred thirty-one thousand, two hundred twenty-one".