243121224331 has 4 divisors (see below), whose sum is σ = 243156047472. Its totient is φ = 243086401192.

The previous prime is 243121224293. The next prime is 243121224383. The reversal of 243121224331 is 133422121342.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243121224331 is a prime.

It is a super-2 number, since 2×243121224331² (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 243121224331.

It is not an unprimeable number, because it can be changed into a prime (243121224431) 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, 17401096 + ... + 17415061.

It is an arithmetic number, because the mean of its divisors is an integer number (60789011868).

Almost surely, 2^243121224331 is an apocalyptic number.

243121224331 is a deficient number, since it is larger than the sum of its proper divisors (34823141).

243121224331 is an equidigital number, since it uses as much as digits as its factorization.

243121224331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34823140.

The product of its digits is 6912, while the sum is 28.

Adding to 243121224331 its reverse (133422121342), we get a palindrome (376543345673).

The spelling of 243121224331 in words is "two hundred forty-three billion, one hundred twenty-one million, two hundred twenty-four thousand, three hundred thirty-one".