21102012000917 has 2 divisors, whose sum is σ = 21102012000918. Its totient is φ = 21102012000916.

The previous prime is 21102012000899. The next prime is 21102012001009. The reversal of 21102012000917 is 71900021020112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20117072862436 + 984939138481 = 4485206^2 + 992441^2 .

It is a cyclic number.

It is not a de Polignac number, because 21102012000917 - 2⁸ = 21102012000661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21102012009917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10551006000458 + 10551006000459.

It is an arithmetic number, because the mean of its divisors is an integer number (10551006000459).

Almost surely, 2^{21102012000917} is an apocalyptic number.

It is an amenable number.

21102012000917 is a deficient number, since it is larger than the sum of its proper divisors (1).

21102012000917 is an equidigital number, since it uses as much as digits as its factorization.

21102012000917 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 504, while the sum is 26.

The spelling of 21102012000917 in words is "twenty-one trillion, one hundred two billion, twelve million, nine hundred seventeen", and thus it is an aban number.