21169370687587 has 2 divisors, whose sum is σ = 21169370687588. Its totient is φ = 21169370687586.

The previous prime is 21169370687567. The next prime is 21169370687639. The reversal of 21169370687587 is 78578607396112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21169370687587 - 2³⁹ = 20619614873699 is a prime.

It is not a weakly prime, because it can be changed into another prime (21169370687537) 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, 10584685343793 + 10584685343794.

It is an arithmetic number, because the mean of its divisors is an integer number (10584685343794).

Almost surely, 2^{21169370687587} is an apocalyptic number.

21169370687587 is a deficient number, since it is larger than the sum of its proper divisors (1).

21169370687587 is an equidigital number, since it uses as much as digits as its factorization.

21169370687587 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 213373440, while the sum is 70.

The spelling of 21169370687587 in words is "twenty-one trillion, one hundred sixty-nine billion, three hundred seventy million, six hundred eighty-seven thousand, five hundred eighty-seven".