121312003 has 2 divisors, whose sum is σ = 121312004. Its totient is φ = 121312002.

The previous prime is 121312001. The next prime is 121312007. The reversal of 121312003 is 300213121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121312003 - 2¹ = 121312001 is a prime.

Together with 121312001, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (121312001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60656001 + 60656002.

It is an arithmetic number, because the mean of its divisors is an integer number (60656002).

Almost surely, 2^121312003 is an apocalyptic number.

121312003 is a deficient number, since it is larger than the sum of its proper divisors (1).

121312003 is an equidigital number, since it uses as much as digits as its factorization.

121312003 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 121312003 is about 11014.1728241389. The cubic root of 121312003 is about 495.0335017967.

Adding to 121312003 its reverse (300213121), we get a palindrome (421525124).

The spelling of 121312003 in words is "one hundred twenty-one million, three hundred twelve thousand, three".