243015253121 has 2 divisors, whose sum is σ = 243015253122. Its totient is φ = 243015253120.

The previous prime is 243015253109. The next prime is 243015253157. The reversal of 243015253121 is 121352510342.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 219510990400 + 23504262721 = 468520^2 + 153311^2 .

It is a cyclic number.

It is not a de Polignac number, because 243015253121 - 2²² = 243011058817 is a prime.

It is not a weakly prime, because it can be changed into another prime (243015253171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121507626560 + 121507626561.

It is an arithmetic number, because the mean of its divisors is an integer number (121507626561).

Almost surely, 2^243015253121 is an apocalyptic number.

It is an amenable number.

243015253121 is a deficient number, since it is larger than the sum of its proper divisors (1).

243015253121 is an equidigital number, since it uses as much as digits as its factorization.

243015253121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7200, while the sum is 29.

Adding to 243015253121 its reverse (121352510342), we get a palindrome (364367763463).

The spelling of 243015253121 in words is "two hundred forty-three billion, fifteen million, two hundred fifty-three thousand, one hundred twenty-one".