27277521756421 has 2 divisors, whose sum is σ = 27277521756422. Its totient is φ = 27277521756420.

The previous prime is 27277521756391. The next prime is 27277521756439. The reversal of 27277521756421 is 12465712577272.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24515975752321 + 2761546004100 = 4951361^2 + 1661790^2 .

It is a cyclic number.

It is not a de Polignac number, because 27277521756421 - 2⁹ = 27277521755909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27277521756451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13638760878210 + 13638760878211.

It is an arithmetic number, because the mean of its divisors is an integer number (13638760878211).

Almost surely, 2^{27277521756421} is an apocalyptic number.

It is an amenable number.

27277521756421 is a deficient number, since it is larger than the sum of its proper divisors (1).

27277521756421 is an equidigital number, since it uses as much as digits as its factorization.

27277521756421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23049600, while the sum is 58.

The spelling of 27277521756421 in words is "twenty-seven trillion, two hundred seventy-seven billion, five hundred twenty-one million, seven hundred fifty-six thousand, four hundred twenty-one".