27751892821 has 2 divisors, whose sum is σ = 27751892822. Its totient is φ = 27751892820.

The previous prime is 27751892813. The next prime is 27751892837. The reversal of 27751892821 is 12829815772.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25335088900 + 2416803921 = 159170^2 + 49161^2 .

It is a cyclic number.

It is not a de Polignac number, because 27751892821 - 2³ = 27751892813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27751892891) 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, 13875946410 + 13875946411.

It is an arithmetic number, because the mean of its divisors is an integer number (13875946411).

Almost surely, 2^27751892821 is an apocalyptic number.

It is an amenable number.

27751892821 is a deficient number, since it is larger than the sum of its proper divisors (1).

27751892821 is an equidigital number, since it uses as much as digits as its factorization.

27751892821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1128960, while the sum is 52.

The spelling of 27751892821 in words is "twenty-seven billion, seven hundred fifty-one million, eight hundred ninety-two thousand, eight hundred twenty-one".