1321210003 has 2 divisors, whose sum is σ = 1321210004. Its totient is φ = 1321210002.

The previous prime is 1321209971. The next prime is 1321210021. The reversal of 1321210003 is 3000121231.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1321210003 - 2⁵ = 1321209971 is a prime.

It is not a weakly prime, because it can be changed into another prime (1321210703) 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 as a sum of consecutive naturals, namely, 660605001 + 660605002.

It is an arithmetic number, because the mean of its divisors is an integer number (660605002).

Almost surely, 2^1321210003 is an apocalyptic number.

1321210003 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321210003 is an equidigital number, since it uses as much as digits as its factorization.

1321210003 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 1321210003 is about 36348.4525530317. The cubic root of 1321210003 is about 1097.2963915749.

Adding to 1321210003 its reverse (3000121231), we get a palindrome (4321331234).

The spelling of 1321210003 in words is "one billion, three hundred twenty-one million, two hundred ten thousand, three".