8103921 has 8 divisors (see below), whose sum is σ = 12348864. Its totient is φ = 4630800.

The previous prime is 8103863. The next prime is 8103923. The reversal of 8103921 is 1293018.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 8103921 - 2⁶ = 8103857 is a prime.

It is a Curzon number.

8103921 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 8103891 and 8103900.

It is not an unprimeable number, because it can be changed into a prime (8103923) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 192930 + ... + 192971.

It is an arithmetic number, because the mean of its divisors is an integer number (1543608).

Almost surely, 2^8103921 is an apocalyptic number.

It is an amenable number.

8103921 is a deficient number, since it is larger than the sum of its proper divisors (4244943).

8103921 is a wasteful number, since it uses less digits than its factorization.

8103921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 385911.

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 8103921 is about 2846.7386602918. The cubic root of 8103921 is about 200.8622853107.

Adding to 8103921 its reverse (1293018), we get a palindrome (9396939).

The spelling of 8103921 in words is "eight million, one hundred three thousand, nine hundred twenty-one".