27756929021 has 2 divisors, whose sum is σ = 27756929022. Its totient is φ = 27756929020.

The previous prime is 27756928999. The next prime is 27756929033. The reversal of 27756929021 is 12092965772.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27504564025 + 252364996 = 165845^2 + 15886^2 .

It is a cyclic number.

It is not a de Polignac number, because 27756929021 - 2¹⁰ = 27756927997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27756929071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13878464510 + 13878464511.

It is an arithmetic number, because the mean of its divisors is an integer number (13878464511).

Almost surely, 2^27756929021 is an apocalyptic number.

It is an amenable number.

27756929021 is a deficient number, since it is larger than the sum of its proper divisors (1).

27756929021 is an equidigital number, since it uses as much as digits as its factorization.

27756929021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 952560, while the sum is 50.

The spelling of 27756929021 in words is "twenty-seven billion, seven hundred fifty-six million, nine hundred twenty-nine thousand, twenty-one".