27982388221 has 2 divisors, whose sum is σ = 27982388222. Its totient is φ = 27982388220.

The previous prime is 27982388201. The next prime is 27982388243. The reversal of 27982388221 is 12288328972.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25879156900 + 2103231321 = 160870^2 + 45861^2 .

It is a cyclic number.

It is not a de Polignac number, because 27982388221 - 2¹⁹ = 27981863933 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27982388201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13991194110 + 13991194111.

It is an arithmetic number, because the mean of its divisors is an integer number (13991194111).

Almost surely, 2^27982388221 is an apocalyptic number.

It is an amenable number.

27982388221 is a deficient number, since it is larger than the sum of its proper divisors (1).

27982388221 is an equidigital number, since it uses as much as digits as its factorization.

27982388221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1548288, while the sum is 52.

The spelling of 27982388221 in words is "twenty-seven billion, nine hundred eighty-two million, three hundred eighty-eight thousand, two hundred twenty-one".