1321066603 has 2 divisors, whose sum is σ = 1321066604. Its totient is φ = 1321066602.

The previous prime is 1321066543. The next prime is 1321066613. The reversal of 1321066603 is 3066601231.

It is a strong prime.

It is an emirp because it is prime and its reverse (3066601231) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1321066603 is a prime.

It is not a weakly prime, because it can be changed into another prime (1321066613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660533301 + 660533302.

It is an arithmetic number, because the mean of its divisors is an integer number (660533302).

Almost surely, 2^1321066603 is an apocalyptic number.

1321066603 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321066603 is an equidigital number, since it uses as much as digits as its factorization.

1321066603 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 28.

The square root of 1321066603 is about 36346.4799258470. The cubic root of 1321066603 is about 1097.2566910995.

Adding to 1321066603 its reverse (3066601231), we get a palindrome (4387667834).

The spelling of 1321066603 in words is "one billion, three hundred twenty-one million, sixty-six thousand, six hundred three".