27420231721 has 2 divisors, whose sum is σ = 27420231722. Its totient is φ = 27420231720.

The previous prime is 27420231703. The next prime is 27420231779. The reversal of 27420231721 is 12713202472.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27279477225 + 140754496 = 165165^2 + 11864^2 .

It is a cyclic number.

It is not a de Polignac number, because 27420231721 - 2⁵ = 27420231689 is a prime.

It is not a weakly prime, because it can be changed into another prime (27420231791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13710115860 + 13710115861.

It is an arithmetic number, because the mean of its divisors is an integer number (13710115861).

Almost surely, 2^27420231721 is an apocalyptic number.

It is an amenable number.

27420231721 is a deficient number, since it is larger than the sum of its proper divisors (1).

27420231721 is an equidigital number, since it uses as much as digits as its factorization.

27420231721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9408, while the sum is 31.

The spelling of 27420231721 in words is "twenty-seven billion, four hundred twenty million, two hundred thirty-one thousand, seven hundred twenty-one".