108931021 has 4 divisors (see below), whose sum is σ = 108960352. Its totient is φ = 108901692.

The previous prime is 108930961. The next prime is 108931037. The reversal of 108931021 is 120139801.

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.

It is a cyclic number.

It is not a de Polignac number, because 108931021 - 2⁷ = 108930893 is a prime.

It is a super-2 number, since 2×108931021² = 23731934672204882, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (108931061) 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 in 3 ways as a sum of consecutive naturals, for example, 8121 + ... + 16846.

It is an arithmetic number, because the mean of its divisors is an integer number (27240088).

Almost surely, 2^108931021 is an apocalyptic number.

It is an amenable number.

108931021 is a deficient number, since it is larger than the sum of its proper divisors (29331).

108931021 is an equidigital number, since it uses as much as digits as its factorization.

108931021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29330.

The product of its (nonzero) digits is 432, while the sum is 25.

The square root of 108931021 is about 10437.0024911370. The cubic root of 108931021 is about 477.5848314693.

The spelling of 108931021 in words is "one hundred eight million, nine hundred thirty-one thousand, twenty-one".