12121003 has 4 divisors (see below), whose sum is σ = 12129768. Its totient is φ = 12112240.

The previous prime is 12120989. The next prime is 12121009. The reversal of 12121003 is 30012121.

12121003 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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, and also an emirpimes, since its reverse is a distinct semiprime: 30012121 = 1487 ⋅20183.

It is a cyclic number.

It is not a de Polignac number, because 12121003 - 2⁹ = 12120491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12121009) 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, 1801 + ... + 5242.

It is an arithmetic number, because the mean of its divisors is an integer number (3032442).

Almost surely, 2^12121003 is an apocalyptic number.

12121003 is a deficient number, since it is larger than the sum of its proper divisors (8765).

12121003 is an equidigital number, since it uses as much as digits as its factorization.

12121003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8764.

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 12121003 is about 3481.5230862368. The cubic root of 12121003 is about 229.7097978229.

Adding to 12121003 its reverse (30012121), we get a palindrome (42133124).

The spelling of 12121003 in words is "twelve million, one hundred twenty-one thousand, three".