239736221 has 2 divisors, whose sum is σ = 239736222. Its totient is φ = 239736220.

The previous prime is 239736197. The next prime is 239736241. The reversal of 239736221 is 122637932.

239736221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 196308121 + 43428100 = 14011^2 + 6590^2 .

It is a cyclic number.

It is not a de Polignac number, because 239736221 - 2¹⁸ = 239474077 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (239736241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 119868110 + 119868111.

It is an arithmetic number, because the mean of its divisors is an integer number (119868111).

Almost surely, 2^239736221 is an apocalyptic number.

It is an amenable number.

239736221 is a deficient number, since it is larger than the sum of its proper divisors (1).

239736221 is an equidigital number, since it uses as much as digits as its factorization.

239736221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27216, while the sum is 35.

The square root of 239736221 is about 15483.4176136924. The cubic root of 239736221 is about 621.2187447620.

The spelling of 239736221 in words is "two hundred thirty-nine million, seven hundred thirty-six thousand, two hundred twenty-one".