108115021 has 6 divisors (see below), whose sum is σ = 125766510. Its totient is φ = 92669976.

The previous prime is 108115013. The next prime is 108115043. The reversal of 108115021 is 120511801.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 83064996 + 25050025 = 9114^2 + 5005^2 .

It is not a de Polignac number, because 108115021 - 2³ = 108115013 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 108115021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (108115001) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1103166 + ... + 1103263.

It is an arithmetic number, because the mean of its divisors is an integer number (20961085).

Almost surely, 2^108115021 is an apocalyptic number.

It is an amenable number.

108115021 is a deficient number, since it is larger than the sum of its proper divisors (17651489).

108115021 is an equidigital number, since it uses as much as digits as its factorization.

108115021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2206443 (or 2206436 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 19.

The square root of 108115021 is about 10397.8373232129. The cubic root of 108115021 is about 476.3893152911.

Adding to 108115021 its reverse (120511801), we get a palindrome (228626822).

The spelling of 108115021 in words is "one hundred eight million, one hundred fifteen thousand, twenty-one".