21282637170689 has 2 divisors, whose sum is σ = 21282637170690. Its totient is φ = 21282637170688.

The previous prime is 21282637170679. The next prime is 21282637170731. The reversal of 21282637170689 is 98607173628212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14444370330625 + 6838266840064 = 3800575^2 + 2615008^2 .

It is a cyclic number.

It is not a de Polignac number, because 21282637170689 - 2⁴⁰ = 20183125542913 is a prime.

It is not a weakly prime, because it can be changed into another prime (21282637170659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10641318585344 + 10641318585345.

It is an arithmetic number, because the mean of its divisors is an integer number (10641318585345).

Almost surely, 2^{21282637170689} is an apocalyptic number.

It is an amenable number.

21282637170689 is a deficient number, since it is larger than the sum of its proper divisors (1).

21282637170689 is an equidigital number, since it uses as much as digits as its factorization.

21282637170689 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24385536, while the sum is 62.

The spelling of 21282637170689 in words is "twenty-one trillion, two hundred eighty-two billion, six hundred thirty-seven million, one hundred seventy thousand, six hundred eighty-nine".