238356578021 has 2 divisors, whose sum is σ = 238356578022. Its totient is φ = 238356578020.

The previous prime is 238356577997. The next prime is 238356578039. The reversal of 238356578021 is 120875653832.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 238134240100 + 222337921 = 487990^2 + 14911^2 .

It is a cyclic number.

It is not a de Polignac number, because 238356578021 - 2²⁶ = 238289469157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (238356578081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 119178289010 + 119178289011.

It is an arithmetic number, because the mean of its divisors is an integer number (119178289011).

Almost surely, 2^238356578021 is an apocalyptic number.

It is an amenable number.

238356578021 is a deficient number, since it is larger than the sum of its proper divisors (1).

238356578021 is an equidigital number, since it uses as much as digits as its factorization.

238356578021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2419200, while the sum is 50.

The spelling of 238356578021 in words is "two hundred thirty-eight billion, three hundred fifty-six million, five hundred seventy-eight thousand, twenty-one".