243320134121 has 4 divisors (see below), whose sum is σ = 243336988500. Its totient is φ = 243303279744.

The previous prime is 243320134111. The next prime is 243320134129. The reversal of 243320134121 is 121431023342.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 240873842521 + 2446291600 = 490789^2 + 49460^2 .

It is a cyclic number.

It is not a de Polignac number, because 243320134121 - 2¹⁰ = 243320133097 is a prime.

It is a super-2 number, since 2×243320134121² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243320134129) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8405516 + ... + 8434413.

It is an arithmetic number, because the mean of its divisors is an integer number (60834247125).

Almost surely, 2^243320134121 is an apocalyptic number.

It is an amenable number.

243320134121 is a deficient number, since it is larger than the sum of its proper divisors (16854379).

243320134121 is a wasteful number, since it uses less digits than its factorization.

243320134121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16854378.

The product of its (nonzero) digits is 3456, while the sum is 26.

Adding to 243320134121 its reverse (121431023342), we get a palindrome (364751157463).

The spelling of 243320134121 in words is "two hundred forty-three billion, three hundred twenty million, one hundred thirty-four thousand, one hundred twenty-one".