21010866903413 has 2 divisors, whose sum is σ = 21010866903414. Its totient is φ = 21010866903412.

The previous prime is 21010866903407. The next prime is 21010866903451. The reversal of 21010866903413 is 31430966801012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18351482202769 + 2659384700644 = 4283863^2 + 1630762^2 .

It is a cyclic number.

It is not a de Polignac number, because 21010866903413 - 2¹² = 21010866899317 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21010866903473) 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, 10505433451706 + 10505433451707.

It is an arithmetic number, because the mean of its divisors is an integer number (10505433451707).

Almost surely, 2^{21010866903413} is an apocalyptic number.

It is an amenable number.

21010866903413 is a deficient number, since it is larger than the sum of its proper divisors (1).

21010866903413 is an equidigital number, since it uses as much as digits as its factorization.

21010866903413 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 186624, while the sum is 44.

The spelling of 21010866903413 in words is "twenty-one trillion, ten billion, eight hundred sixty-six million, nine hundred three thousand, four hundred thirteen".