21016586738333 has 2 divisors, whose sum is σ = 21016586738334. Its totient is φ = 21016586738332.

The previous prime is 21016586738297. The next prime is 21016586738347. The reversal of 21016586738333 is 33383768561012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12858234162244 + 8158352576089 = 3585838^2 + 2856283^2 .

It is a cyclic number.

It is not a de Polignac number, because 21016586738333 - 2²² = 21016582544029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21016586738353) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10508293369166 + 10508293369167.

It is an arithmetic number, because the mean of its divisors is an integer number (10508293369167).

Almost surely, 2^{21016586738333} is an apocalyptic number.

It is an amenable number.

21016586738333 is a deficient number, since it is larger than the sum of its proper divisors (1).

21016586738333 is an equidigital number, since it uses as much as digits as its factorization.

21016586738333 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13063680, while the sum is 56.

The spelling of 21016586738333 in words is "twenty-one trillion, sixteen billion, five hundred eighty-six million, seven hundred thirty-eight thousand, three hundred thirty-three".