243121245255 has 80 divisors (see below), whose sum is σ = 498298521600. Its totient is φ = 111091704768.

The previous prime is 243121245239. The next prime is 243121245259. The reversal of 243121245255 is 552542121342.

243121245255 is a `hidden beast` number, since 2 + 4 + 3 + 1 + 2 + 124 + 525 + 5 = 666.

It is not a de Polignac number, because 243121245255 - 2⁴ = 243121245239 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243121245259) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 6783292 + ... + 6819038.

It is an arithmetic number, because the mean of its divisors is an integer number (6228731520).

Almost surely, 2^243121245255 is an apocalyptic number.

243121245255 is an abundant number, since it is smaller than the sum of its proper divisors (255177276345).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

243121245255 is a wasteful number, since it uses less digits than its factorization.

243121245255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38170 (or 38161 counting only the distinct ones).

The product of its digits is 96000, while the sum is 36.

Adding to 243121245255 its reverse (552542121342), we get a palindrome (795663366597).

The spelling of 243121245255 in words is "two hundred forty-three billion, one hundred twenty-one million, two hundred forty-five thousand, two hundred fifty-five".