243121422113 has 4 divisors (see below), whose sum is σ = 243297470868. Its totient is φ = 242945373360.

The previous prime is 243121422109. The next prime is 243121422161. The reversal of 243121422113 is 311224121342.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 311224121342 = 2 ⋅155612060671.

It can be written as a sum of positive squares in 2 ways, for example, as 55933669009 + 187187753104 = 236503^2 + 432652^2 .

It is a cyclic number.

It is not a de Polignac number, because 243121422113 - 2² = 243121422109 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243121482113) 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, 88022306 + ... + 88025067.

It is an arithmetic number, because the mean of its divisors is an integer number (60824367717).

Almost surely, 2^243121422113 is an apocalyptic number.

It is an amenable number.

243121422113 is a deficient number, since it is larger than the sum of its proper divisors (176048755).

243121422113 is a wasteful number, since it uses less digits than its factorization.

243121422113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176048754.

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

Adding to 243121422113 its reverse (311224121342), we get a palindrome (554345543455).

The spelling of 243121422113 in words is "two hundred forty-three billion, one hundred twenty-one million, four hundred twenty-two thousand, one hundred thirteen".