115117021 has 2 divisors, whose sum is σ = 115117022. Its totient is φ = 115117020.

The previous prime is 115117019. The next prime is 115117031. The reversal of 115117021 is 120711511.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 104325796 + 10791225 = 10214^2 + 3285^2 .

It is an emirp because it is prime and its reverse (120711511) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 115117021 - 2¹ = 115117019 is a prime.

Together with 115117019, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 115117021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (115117031) 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, 57558510 + 57558511.

It is an arithmetic number, because the mean of its divisors is an integer number (57558511).

Almost surely, 2^115117021 is an apocalyptic number.

It is an amenable number.

115117021 is a deficient number, since it is larger than the sum of its proper divisors (1).

115117021 is an equidigital number, since it uses as much as digits as its factorization.

115117021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 70, while the sum is 19.

The square root of 115117021 is about 10729.2600397231. The cubic root of 115117021 is about 486.4593040288.

Adding to 115117021 its reverse (120711511), we get a palindrome (235828532).

The spelling of 115117021 in words is "one hundred fifteen million, one hundred seventeen thousand, twenty-one".