243120334221 has 32 divisors (see below), whose sum is σ = 362192394240. Its totient is φ = 161174476800.

The previous prime is 243120334187. The next prime is 243120334271. The reversal of 243120334221 is 122433021342.

243120334221 is a `hidden beast` number, since 2 + 4 + 31 + 203 + 3 + 422 + 1 = 666.

It is not a de Polignac number, because 243120334221 - 2³⁰ = 242046592397 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243120334271) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 18522541 + ... + 18535661.

It is an arithmetic number, because the mean of its divisors is an integer number (11318512320).

Almost surely, 2^243120334221 is an apocalyptic number.

It is an amenable number.

243120334221 is a deficient number, since it is larger than the sum of its proper divisors (119072060019).

243120334221 is a wasteful number, since it uses less digits than its factorization.

243120334221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16914 (or 16908 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 27.

Adding to 243120334221 its reverse (122433021342), we get a palindrome (365553355563).

The spelling of 243120334221 in words is "two hundred forty-three billion, one hundred twenty million, three hundred thirty-four thousand, two hundred twenty-one".