27774524221 has 2 divisors, whose sum is σ = 27774524222. Its totient is φ = 27774524220.

The previous prime is 27774524203. The next prime is 27774524227. The reversal of 27774524221 is 12242547772.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19688018596 + 8086505625 = 140314^2 + 89925^2 .

It is a cyclic number.

It is not a de Polignac number, because 27774524221 - 2¹¹ = 27774522173 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27774524227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13887262110 + 13887262111.

It is an arithmetic number, because the mean of its divisors is an integer number (13887262111).

Almost surely, 2^27774524221 is an apocalyptic number.

It is an amenable number.

27774524221 is a deficient number, since it is larger than the sum of its proper divisors (1).

27774524221 is an equidigital number, since it uses as much as digits as its factorization.

27774524221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 439040, while the sum is 43.

The spelling of 27774524221 in words is "twenty-seven billion, seven hundred seventy-four million, five hundred twenty-four thousand, two hundred twenty-one".