108730921 has 4 divisors (see below), whose sum is σ = 117094852. Its totient is φ = 100366992.

The previous prime is 108730877. The next prime is 108730933. The reversal of 108730921 is 129037801.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 129037801 = 2687 ⋅48023.

It can be written as a sum of positive squares in 2 ways, for example, as 32080896 + 76650025 = 5664^2 + 8755^2 .

It is a cyclic number.

It is not a de Polignac number, because 108730921 - 2¹⁹ = 108206633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (108730991) 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, 4181946 + ... + 4181971.

It is an arithmetic number, because the mean of its divisors is an integer number (29273713).

Almost surely, 2^108730921 is an apocalyptic number.

It is an amenable number.

108730921 is a deficient number, since it is larger than the sum of its proper divisors (8363931).

108730921 is an equidigital number, since it uses as much as digits as its factorization.

108730921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8363930.

The product of its (nonzero) digits is 3024, while the sum is 31.

The square root of 108730921 is about 10427.4119991492. The cubic root of 108730921 is about 477.2922203003.

The spelling of 108730921 in words is "one hundred eight million, seven hundred thirty thousand, nine hundred twenty-one".