238838221 has 2 divisors, whose sum is σ = 238838222. Its totient is φ = 238838220.

The previous prime is 238838203. The next prime is 238838239. The reversal of 238838221 is 122838832.

It is a balanced prime because it is at equal distance from previous prime (238838203) and next prime (238838239).

It can be written as a sum of positive squares in only one way, i.e., 215208900 + 23629321 = 14670^2 + 4861^2 .

It is a cyclic number.

It is not a de Polignac number, because 238838221 - 2¹⁵ = 238805453 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (238838921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 119419110 + 119419111.

It is an arithmetic number, because the mean of its divisors is an integer number (119419111).

Almost surely, 2^238838221 is an apocalyptic number.

It is an amenable number.

238838221 is a deficient number, since it is larger than the sum of its proper divisors (1).

238838221 is an equidigital number, since it uses as much as digits as its factorization.

238838221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36864, while the sum is 37.

The square root of 238838221 is about 15454.3916412132. The cubic root of 238838221 is about 620.4421239444.

The spelling of 238838221 in words is "two hundred thirty-eight million, eight hundred thirty-eight thousand, two hundred twenty-one".