243113221123 has 4 divisors (see below), whose sum is σ = 243119650320. Its totient is φ = 243106791928.

The previous prime is 243113221069. The next prime is 243113221157. The reversal of 243113221123 is 321122311342.

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

It is a cyclic number.

It is not a de Polignac number, because 243113221123 - 2³⁷ = 105674267651 is a prime.

It is a super-2 number, since 2×243113221123² (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 (243113221523) 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, 3157540 + ... + 3233617.

It is an arithmetic number, because the mean of its divisors is an integer number (60779912580).

Almost surely, 2^243113221123 is an apocalyptic number.

243113221123 is a deficient number, since it is larger than the sum of its proper divisors (6429197).

243113221123 is an equidigital number, since it uses as much as digits as its factorization.

243113221123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6429196.

The product of its digits is 1728, while the sum is 25.

Adding to 243113221123 its reverse (321122311342), we get a palindrome (564235532465).

The spelling of 243113221123 in words is "two hundred forty-three billion, one hundred thirteen million, two hundred twenty-one thousand, one hundred twenty-three".