103921 has 4 divisors (see below), whose sum is σ = 110052. Its totient is φ = 97792.

The previous prime is 103919. The next prime is 103951. The reversal of 103921 is 129301.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 69696 + 34225 = 264^2 + 185^2 .

It is a cyclic number.

It is not a de Polignac number, because 103921 - 2¹ = 103919 is a prime.

It is a Duffinian number.

103921 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 103895 and 103904.

It is not an unprimeable number, because it can be changed into a prime (103951) 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, 3040 + ... + 3073.

It is an arithmetic number, because the mean of its divisors is an integer number (27513).

2¹⁰³⁹²¹ is an apocalyptic number.

It is an amenable number.

103921 is a deficient number, since it is larger than the sum of its proper divisors (6131).

103921 is an equidigital number, since it uses as much as digits as its factorization.

103921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6130.

The product of its (nonzero) digits is 54, while the sum is 16.

The square root of 103921 is about 322.3678023625. The cubic root of 103921 is about 47.0147833381.

It can be divided in two parts, 103 and 921, that added together give a 10-th power (1024 = 2¹⁰).

The spelling of 103921 in words is "one hundred three thousand, nine hundred twenty-one".