243113121242 has 4 divisors (see below), whose sum is σ = 364669681866. Its totient is φ = 121556560620.

The previous prime is 243113121241. The next prime is 243113121257. The reversal of 243113121242 is 242121311342.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 229365324241 + 13747797001 = 478921^2 + 117251^2 .

It is not an unprimeable number, because it can be changed into a prime (243113121241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60778280309 + ... + 60778280312.

Almost surely, 2^243113121242 is an apocalyptic number.

243113121242 is a deficient number, since it is larger than the sum of its proper divisors (121556560624).

243113121242 is a wasteful number, since it uses less digits than its factorization.

243113121242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121556560623.

The product of its digits is 2304, while the sum is 26.

Adding to 243113121242 its reverse (242121311342), we get a palindrome (485234432584).

The spelling of 243113121242 in words is "two hundred forty-three billion, one hundred thirteen million, one hundred twenty-one thousand, two hundred forty-two".