5238138121 has 2 divisors, whose sum is σ = 5238138122. Its totient is φ = 5238138120.

The previous prime is 5238138119. The next prime is 5238138131. The reversal of 5238138121 is 1218318325.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2669168896 + 2568969225 = 51664^2 + 50685^2 .

It is a cyclic number.

It is not a de Polignac number, because 5238138121 - 2¹ = 5238138119 is a prime.

Together with 5238138119, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (5238138131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2619069060 + 2619069061.

It is an arithmetic number, because the mean of its divisors is an integer number (2619069061).

Almost surely, 2^5238138121 is an apocalyptic number.

It is an amenable number.

5238138121 is a deficient number, since it is larger than the sum of its proper divisors (1).

5238138121 is an equidigital number, since it uses as much as digits as its factorization.

5238138121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11520, while the sum is 34.

The square root of 5238138121 is about 72374.9827012069. The cubic root of 5238138121 is about 1736.7033764138.

The spelling of 5238138121 in words is "five billion, two hundred thirty-eight million, one hundred thirty-eight thousand, one hundred twenty-one".