115300021 has 4 divisors (see below), whose sum is σ = 115321600. Its totient is φ = 115278444.

The previous prime is 115299997. The next prime is 115300033. The reversal of 115300021 is 120003511.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 120003511 = 31 ⋅3871081.

It is a cyclic number.

It is not a de Polignac number, because 115300021 - 2⁷ = 115299893 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 115299974 and 115300010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (115300061) 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, 3820 + ... + 15658.

It is an arithmetic number, because the mean of its divisors is an integer number (28830400).

Almost surely, 2^115300021 is an apocalyptic number.

It is an amenable number.

115300021 is a deficient number, since it is larger than the sum of its proper divisors (21579).

115300021 is an equidigital number, since it uses as much as digits as its factorization.

115300021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21578.

The product of its (nonzero) digits is 30, while the sum is 13.

The square root of 115300021 is about 10737.7847342923. The cubic root of 115300021 is about 486.7169401892.

Adding to 115300021 its reverse (120003511), we get a palindrome (235303532).

The spelling of 115300021 in words is "one hundred fifteen million, three hundred thousand, twenty-one".