21376765407377 has 2 divisors, whose sum is σ = 21376765407378. Its totient is φ = 21376765407376.

The previous prime is 21376765407337. The next prime is 21376765407383. The reversal of 21376765407377 is 77370456767312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20745191886721 + 631573520656 = 4554689^2 + 794716^2 .

It is a cyclic number.

It is not a de Polignac number, because 21376765407377 - 2¹² = 21376765403281 is a prime.

It is not a weakly prime, because it can be changed into another prime (21376765407337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10688382703688 + 10688382703689.

It is an arithmetic number, because the mean of its divisors is an integer number (10688382703689).

Almost surely, 2^{21376765407377} is an apocalyptic number.

It is an amenable number.

21376765407377 is a deficient number, since it is larger than the sum of its proper divisors (1).

21376765407377 is an equidigital number, since it uses as much as digits as its factorization.

21376765407377 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 217818720, while the sum is 65.

The spelling of 21376765407377 in words is "twenty-one trillion, three hundred seventy-six billion, seven hundred sixty-five million, four hundred seven thousand, three hundred seventy-seven".