27804221 has 2 divisors, whose sum is σ = 27804222. Its totient is φ = 27804220.

The previous prime is 27804211. The next prime is 27804233. The reversal of 27804221 is 12240872.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26152996 + 1651225 = 5114^2 + 1285^2 .

It is a cyclic number.

It is not a de Polignac number, because 27804221 - 2⁶ = 27804157 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 (27804211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13902110 + 13902111.

It is an arithmetic number, because the mean of its divisors is an integer number (13902111).

Almost surely, 2^27804221 is an apocalyptic number.

It is an amenable number.

27804221 is a deficient number, since it is larger than the sum of its proper divisors (1).

27804221 is an equidigital number, since it uses as much as digits as its factorization.

27804221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1792, while the sum is 26.

The square root of 27804221 is about 5272.9707945332. The cubic root of 27804221 is about 302.9495027074.

The spelling of 27804221 in words is "twenty-seven million, eight hundred four thousand, two hundred twenty-one".