238528068721 has 4 divisors (see below), whose sum is σ = 238880400372. Its totient is φ = 238175737072.

The previous prime is 238528068719. The next prime is 238528068767. The reversal of 238528068721 is 127860825832.

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

It can be written as a sum of positive squares in 2 ways, for example, as 229019673600 + 9508395121 = 478560^2 + 97511^2 .

It is a cyclic number.

It is not a de Polignac number, because 238528068721 - 2¹ = 238528068719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (238528068221) 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, 176164810 + ... + 176166163.

It is an arithmetic number, because the mean of its divisors is an integer number (59720100093).

Almost surely, 2^238528068721 is an apocalyptic number.

It is an amenable number.

238528068721 is a deficient number, since it is larger than the sum of its proper divisors (352331651).

238528068721 is an equidigital number, since it uses as much as digits as its factorization.

238528068721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 352331650.

The product of its (nonzero) digits is 2580480, while the sum is 52.

The spelling of 238528068721 in words is "two hundred thirty-eight billion, five hundred twenty-eight million, sixty-eight thousand, seven hundred twenty-one".