108003821 has 4 divisors (see below), whose sum is σ = 108211644. Its totient is φ = 107796000.

The previous prime is 108003817. The next prime is 108003827. The reversal of 108003821 is 128300801.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 128300801 = 8929 ⋅14369.

It can be written as a sum of positive squares in 2 ways, for example, as 14668900 + 93334921 = 3830^2 + 9661^2 .

It is a cyclic number.

It is not a de Polignac number, because 108003821 - 2² = 108003817 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (108003827) 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, 103130 + ... + 104171.

It is an arithmetic number, because the mean of its divisors is an integer number (27052911).

Almost surely, 2^108003821 is an apocalyptic number.

It is an amenable number.

108003821 is a deficient number, since it is larger than the sum of its proper divisors (207823).

108003821 is an equidigital number, since it uses as much as digits as its factorization.

108003821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207822.

The product of its (nonzero) digits is 384, while the sum is 23.

The square root of 108003821 is about 10392.4886817355. The cubic root of 108003821 is about 476.2259316904.

The spelling of 108003821 in words is "one hundred eight million, three thousand, eight hundred twenty-one".