243121241255 has 4 divisors (see below), whose sum is σ = 291745489512. Its totient is φ = 194496993000.

The previous prime is 243121241221. The next prime is 243121241269. The reversal of 243121241255 is 552142121342.

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

It is not a de Polignac number, because 243121241255 - 2¹⁸ = 243120979111 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24312124121 + ... + 24312124130.

It is an arithmetic number, because the mean of its divisors is an integer number (72936372378).

Almost surely, 2^243121241255 is an apocalyptic number.

243121241255 is a deficient number, since it is larger than the sum of its proper divisors (48624248257).

243121241255 is an equidigital number, since it uses as much as digits as its factorization.

243121241255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48624248256.

The product of its digits is 19200, while the sum is 32.

Adding to 243121241255 its reverse (552142121342), we get a palindrome (795263362597).

The spelling of 243121241255 in words is "two hundred forty-three billion, one hundred twenty-one million, two hundred forty-one thousand, two hundred fifty-five".