10515621217 has 2 divisors, whose sum is σ = 10515621218. Its totient is φ = 10515621216.

The previous prime is 10515621199. The next prime is 10515621239. The reversal of 10515621217 is 71212651501.

10515621217 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10515271936 + 349281 = 102544^2 + 591^2 .

It is a cyclic number.

It is not a de Polignac number, because 10515621217 - 2¹⁵ = 10515588449 is a prime.

It is a super-2 number, since 2×10515621217² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (10515621317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5257810608 + 5257810609.

It is an arithmetic number, because the mean of its divisors is an integer number (5257810609).

Almost surely, 2^10515621217 is an apocalyptic number.

It is an amenable number.

10515621217 is a deficient number, since it is larger than the sum of its proper divisors (1).

10515621217 is an equidigital number, since it uses as much as digits as its factorization.

10515621217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4200, while the sum is 31.

The spelling of 10515621217 in words is "ten billion, five hundred fifteen million, six hundred twenty-one thousand, two hundred seventeen".