121903 has 4 divisors (see below), whose sum is σ = 122920. Its totient is φ = 120888.

The previous prime is 121889. The next prime is 121909. The reversal of 121903 is 309121.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121903 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 300 + ... + 577.

It is an arithmetic number, because the mean of its divisors is an integer number (30730).

2¹²¹⁹⁰³ is an apocalyptic number.

121903 is a deficient number, since it is larger than the sum of its proper divisors (1017).

121903 is an equidigital number, since it uses as much as digits as its factorization.

121903 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1016.

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

The square root of 121903 is about 349.1461012241. The cubic root of 121903 is about 49.5836086576.

It can be divided in two parts, 121 and 903, that added together give a 10-th power (1024 = 2¹⁰).

The spelling of 121903 in words is "one hundred twenty-one thousand, nine hundred three".