27340320421 has 2 divisors, whose sum is σ = 27340320422. Its totient is φ = 27340320420.

The previous prime is 27340320383. The next prime is 27340320443. The reversal of 27340320421 is 12402304372.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16080776100 + 11259544321 = 126810^2 + 106111^2 .

It is a cyclic number.

It is not a de Polignac number, because 27340320421 - 2¹¹ = 27340318373 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 27340320421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27340320121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13670160210 + 13670160211.

It is an arithmetic number, because the mean of its divisors is an integer number (13670160211).

Almost surely, 2^27340320421 is an apocalyptic number.

It is an amenable number.

27340320421 is a deficient number, since it is larger than the sum of its proper divisors (1).

27340320421 is an equidigital number, since it uses as much as digits as its factorization.

27340320421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8064, while the sum is 28.

Adding to 27340320421 its reverse (12402304372), we get a palindrome (39742624793).

The spelling of 27340320421 in words is "twenty-seven billion, three hundred forty million, three hundred twenty thousand, four hundred twenty-one".