21073008637669 has 2 divisors, whose sum is σ = 21073008637670. Its totient is φ = 21073008637668.

The previous prime is 21073008637607. The next prime is 21073008637739. The reversal of 21073008637669 is 96673680037012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20305054368769 + 767954268900 = 4506113^2 + 876330^2 .

It is a cyclic number.

It is not a de Polignac number, because 21073008637669 - 2²⁹ = 21072471766757 is a prime.

It is a super-2 number, since 2×21073008637669² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21073008637169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10536504318834 + 10536504318835.

It is an arithmetic number, because the mean of its divisors is an integer number (10536504318835).

Almost surely, 2^{21073008637669} is an apocalyptic number.

It is an amenable number.

21073008637669 is a deficient number, since it is larger than the sum of its proper divisors (1).

21073008637669 is an equidigital number, since it uses as much as digits as its factorization.

21073008637669 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13716864, while the sum is 58.

The spelling of 21073008637669 in words is "twenty-one trillion, seventy-three billion, eight million, six hundred thirty-seven thousand, six hundred sixty-nine".