115636021 has 4 divisors (see below), whose sum is σ = 119623500. Its totient is φ = 111648544.

The previous prime is 115635991. The next prime is 115636049. The reversal of 115636021 is 120636511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 120636511 = 2311 ⋅52201.

It can be written as a sum of positive squares in 2 ways, for example, as 35533521 + 80102500 = 5961^2 + 8950^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-115636021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (115636061) 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, 1993696 + ... + 1993753.

It is an arithmetic number, because the mean of its divisors is an integer number (29905875).

Almost surely, 2^115636021 is an apocalyptic number.

It is an amenable number.

115636021 is a deficient number, since it is larger than the sum of its proper divisors (3987479).

115636021 is an equidigital number, since it uses as much as digits as its factorization.

115636021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3987478.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 115636021 is about 10753.4190376829. The cubic root of 115636021 is about 487.1892682104.

The spelling of 115636021 in words is "one hundred fifteen million, six hundred thirty-six thousand, twenty-one".