21376765407337 has 2 divisors, whose sum is σ = 21376765407338. Its totient is φ = 21376765407336.

The previous prime is 21376765407331. The next prime is 21376765407377. The reversal of 21376765407337 is 73370456767312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21159300805776 + 217464601561 = 4599924^2 + 466331^2 .

It is a cyclic number.

It is not a de Polignac number, because 21376765407337 - 2⁷ = 21376765407209 is a prime.

It is not a weakly prime, because it can be changed into another prime (21376765407331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10688382703668 + 10688382703669.

It is an arithmetic number, because the mean of its divisors is an integer number (10688382703669).

Almost surely, 2^{21376765407337} is an apocalyptic number.

It is an amenable number.

21376765407337 is a deficient number, since it is larger than the sum of its proper divisors (1).

21376765407337 is an equidigital number, since it uses as much as digits as its factorization.

21376765407337 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 93350880, while the sum is 61.

The spelling of 21376765407337 in words is "twenty-one trillion, three hundred seventy-six billion, seven hundred sixty-five million, four hundred seven thousand, three hundred thirty-seven".