20215216130117 has 2 divisors, whose sum is σ = 20215216130118. Its totient is φ = 20215216130116.

The previous prime is 20215216130027. The next prime is 20215216130279. The reversal of 20215216130117 is 71103161251202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19220806295716 + 994409834401 = 4384154^2 + 997201^2 .

It is a cyclic number.

It is not a de Polignac number, because 20215216130117 - 2¹⁶ = 20215216064581 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20215216130617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10107608065058 + 10107608065059.

It is an arithmetic number, because the mean of its divisors is an integer number (10107608065059).

Almost surely, 2^{20215216130117} is an apocalyptic number.

It is an amenable number.

20215216130117 is a deficient number, since it is larger than the sum of its proper divisors (1).

20215216130117 is an equidigital number, since it uses as much as digits as its factorization.

20215216130117 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5040, while the sum is 32.

Adding to 20215216130117 its reverse (71103161251202), we get a palindrome (91318377381319).

The spelling of 20215216130117 in words is "twenty trillion, two hundred fifteen billion, two hundred sixteen million, one hundred thirty thousand, one hundred seventeen".