27571912721 has 2 divisors, whose sum is σ = 27571912722. Its totient is φ = 27571912720.

The previous prime is 27571912691. The next prime is 27571912733. The reversal of 27571912721 is 12721917572.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23750200321 + 3821712400 = 154111^2 + 61820^2 .

It is a cyclic number.

It is not a de Polignac number, because 27571912721 - 2⁶ = 27571912657 is a prime.

It is not a weakly prime, because it can be changed into another prime (27571912751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13785956360 + 13785956361.

It is an arithmetic number, because the mean of its divisors is an integer number (13785956361).

Almost surely, 2^27571912721 is an apocalyptic number.

It is an amenable number.

27571912721 is a deficient number, since it is larger than the sum of its proper divisors (1).

27571912721 is an equidigital number, since it uses as much as digits as its factorization.

27571912721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 123480, while the sum is 44.

The spelling of 27571912721 in words is "twenty-seven billion, five hundred seventy-one million, nine hundred twelve thousand, seven hundred twenty-one".