21184930332817 has 2 divisors, whose sum is σ = 21184930332818. Its totient is φ = 21184930332816.

The previous prime is 21184930332781. The next prime is 21184930332851. The reversal of 21184930332817 is 71823303948112.

Together with previous prime (21184930332781) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20236178359296 + 948751973521 = 4498464^2 + 974039^2 .

It is a cyclic number.

It is not a de Polignac number, because 21184930332817 - 2⁴³ = 12388837310609 is a prime.

It is not a weakly prime, because it can be changed into another prime (21184930332217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10592465166408 + 10592465166409.

It is an arithmetic number, because the mean of its divisors is an integer number (10592465166409).

Almost surely, 2^{21184930332817} is an apocalyptic number.

It is an amenable number.

21184930332817 is a deficient number, since it is larger than the sum of its proper divisors (1).

21184930332817 is an equidigital number, since it uses as much as digits as its factorization.

21184930332817 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1741824, while the sum is 52.

The spelling of 21184930332817 in words is "twenty-one trillion, one hundred eighty-four billion, nine hundred thirty million, three hundred thirty-two thousand, eight hundred seventeen".