21116500061533 has 2 divisors, whose sum is σ = 21116500061534. Its totient is φ = 21116500061532.

The previous prime is 21116500061491. The next prime is 21116500061543. The reversal of 21116500061533 is 33516000561112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20467544147449 + 648955914084 = 4524107^2 + 805578^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21116500061533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21116500061543) 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, 10558250030766 + 10558250030767.

It is an arithmetic number, because the mean of its divisors is an integer number (10558250030767).

Almost surely, 2^{21116500061533} is an apocalyptic number.

It is an amenable number.

21116500061533 is a deficient number, since it is larger than the sum of its proper divisors (1).

21116500061533 is an equidigital number, since it uses as much as digits as its factorization.

21116500061533 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16200, while the sum is 34.

The spelling of 21116500061533 in words is "twenty-one trillion, one hundred sixteen billion, five hundred million, sixty-one thousand, five hundred thirty-three".