27278882221 has 2 divisors, whose sum is σ = 27278882222. Its totient is φ = 27278882220.

The previous prime is 27278882209. The next prime is 27278882263. The reversal of 27278882221 is 12228887272.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27187392996 + 91489225 = 164886^2 + 9565^2 .

It is a cyclic number.

It is not a de Polignac number, because 27278882221 - 2⁹ = 27278881709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27278882201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13639441110 + 13639441111.

It is an arithmetic number, because the mean of its divisors is an integer number (13639441111).

Almost surely, 2^27278882221 is an apocalyptic number.

It is an amenable number.

27278882221 is a deficient number, since it is larger than the sum of its proper divisors (1).

27278882221 is an equidigital number, since it uses as much as digits as its factorization.

27278882221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 802816, while the sum is 49.

The spelling of 27278882221 in words is "twenty-seven billion, two hundred seventy-eight million, eight hundred eighty-two thousand, two hundred twenty-one".