238860421157 has 2 divisors, whose sum is σ = 238860421158. Its totient is φ = 238860421156.

The previous prime is 238860421091. The next prime is 238860421207. The reversal of 238860421157 is 751124068832.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 166528470241 + 72331950916 = 408079^2 + 268946^2 .

It is a cyclic number.

It is not a de Polignac number, because 238860421157 - 2¹⁴ = 238860404773 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (238860421757) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 119430210578 + 119430210579.

It is an arithmetic number, because the mean of its divisors is an integer number (119430210579).

Almost surely, 2^238860421157 is an apocalyptic number.

It is an amenable number.

238860421157 is a deficient number, since it is larger than the sum of its proper divisors (1).

238860421157 is an equidigital number, since it uses as much as digits as its factorization.

238860421157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 645120, while the sum is 47.

Adding to 238860421157 its reverse (751124068832), we get a palindrome (989984489989).

The spelling of 238860421157 in words is "two hundred thirty-eight billion, eight hundred sixty million, four hundred twenty-one thousand, one hundred fifty-seven".