13021603 has 6 divisors (see below), whose sum is σ = 15147636. Its totient is φ = 11161332.

The previous prime is 13021597. The next prime is 13021607. The reversal of 13021603 is 30612031.

13021603 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-13021603 is a prime.

It is a plaindrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (13021607) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 132825 + ... + 132922.

It is an arithmetic number, because the mean of its divisors is an integer number (2524606).

Almost surely, 2^13021603 is an apocalyptic number.

13021603 is a deficient number, since it is larger than the sum of its proper divisors (2126033).

13021603 is an equidigital number, since it uses as much as digits as its factorization.

13021603 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 265761 (or 265754 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 13021603 is about 3608.5458290009. The cubic root of 13021603 is about 235.2636425469.

Adding to 13021603 its reverse (30612031), we get a palindrome (43633634).

The spelling of 13021603 in words is "thirteen million, twenty-one thousand, six hundred three".