100515211217 has 4 divisors (see below), whose sum is σ = 101189810100. Its totient is φ = 99840612336.

The previous prime is 100515211169. The next prime is 100515211231. The reversal of 100515211217 is 712112515001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 712112515001 = 641 ⋅1110939961.

It can be written as a sum of positive squares in 2 ways, for example, as 3908625361 + 96606585856 = 62519^2 + 310816^2 .

It is a cyclic number.

It is not a de Polignac number, because 100515211217 - 2¹⁶ = 100515145681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (100515211267) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 337299218 + ... + 337299515.

It is an arithmetic number, because the mean of its divisors is an integer number (25297452525).

Almost surely, 2^100515211217 is an apocalyptic number.

It is an amenable number.

100515211217 is a deficient number, since it is larger than the sum of its proper divisors (674598883).

100515211217 is an equidigital number, since it uses as much as digits as its factorization.

100515211217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 674598882.

The product of its (nonzero) digits is 700, while the sum is 26.

Adding to 100515211217 its reverse (712112515001), we get a palindrome (812627726218).

The spelling of 100515211217 in words is "one hundred billion, five hundred fifteen million, two hundred eleven thousand, two hundred seventeen".