243121413331 has 4 divisors (see below), whose sum is σ = 245627819752. Its totient is φ = 240615006912.

The previous prime is 243121413323. The next prime is 243121413349. The reversal of 243121413331 is 133314121342.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 133314121342 = 2 ⋅66657060671.

It is a cyclic number.

It is not a de Polignac number, because 243121413331 - 2³ = 243121413323 is a prime.

It is a super-2 number, since 2×243121413331² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 243121413331.

It is not an unprimeable number, because it can be changed into a prime (243121413361) 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, 1253203065 + ... + 1253203258.

It is an arithmetic number, because the mean of its divisors is an integer number (61406954938).

Almost surely, 2^243121413331 is an apocalyptic number.

243121413331 is a deficient number, since it is larger than the sum of its proper divisors (2506406421).

243121413331 is an equidigital number, since it uses as much as digits as its factorization.

243121413331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2506406420.

The product of its digits is 5184, while the sum is 28.

Adding to 243121413331 its reverse (133314121342), we get a palindrome (376435534673).

The spelling of 243121413331 in words is "two hundred forty-three billion, one hundred twenty-one million, four hundred thirteen thousand, three hundred thirty-one".