243121112331 has 4 divisors (see below), whose sum is σ = 324161483112. Its totient is φ = 162080741552.

The previous prime is 243121112293. The next prime is 243121112359. The reversal of 243121112331 is 133211121342.

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 243121112331 - 2¹¹ = 243121110283 is a prime.

It is a super-2 number, since 2×243121112331² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (243121112371) 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, 40520185386 + ... + 40520185391.

It is an arithmetic number, because the mean of its divisors is an integer number (81040370778).

Almost surely, 2^243121112331 is an apocalyptic number.

243121112331 is a deficient number, since it is larger than the sum of its proper divisors (81040370781).

243121112331 is an equidigital number, since it uses as much as digits as its factorization.

243121112331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81040370780.

The product of its digits is 864, while the sum is 24.

Adding to 243121112331 its reverse (133211121342), we get a palindrome (376332233673).

The spelling of 243121112331 in words is "two hundred forty-three billion, one hundred twenty-one million, one hundred twelve thousand, three hundred thirty-one".