239821982221 has 2 divisors, whose sum is σ = 239821982222. Its totient is φ = 239821982220.

The previous prime is 239821982203. The next prime is 239821982269. The reversal of 239821982221 is 122289128932.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 222726419721 + 17095562500 = 471939^2 + 130750^2 .

It is a cyclic number.

It is not a de Polignac number, because 239821982221 - 2⁵ = 239821982189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (239821982291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 119910991110 + 119910991111.

It is an arithmetic number, because the mean of its divisors is an integer number (119910991111).

Almost surely, 2^239821982221 is an apocalyptic number.

It is an amenable number.

239821982221 is a deficient number, since it is larger than the sum of its proper divisors (1).

239821982221 is an equidigital number, since it uses as much as digits as its factorization.

239821982221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 497664, while the sum is 49.

The spelling of 239821982221 in words is "two hundred thirty-nine billion, eight hundred twenty-one million, nine hundred eighty-two thousand, two hundred twenty-one".