13221603 has 8 divisors (see below), whose sum is σ = 19587600. Its totient is φ = 8814384.

The previous prime is 13221599. The next prime is 13221623. The reversal of 13221603 is 30612231.

It is not a de Polignac number, because 13221603 - 2² = 13221599 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13221623) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 244818 + ... + 244871.

It is an arithmetic number, because the mean of its divisors is an integer number (2448450).

Almost surely, 2^13221603 is an apocalyptic number.

13221603 is a deficient number, since it is larger than the sum of its proper divisors (6365997).

13221603 is an equidigital number, since it uses as much as digits as its factorization.

13221603 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 489698 (or 489692 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 13221603 is about 3636.1522245363. The cubic root of 13221603 is about 236.4620067188.

Adding to 13221603 its reverse (30612231), we get a palindrome (43833834).

It can be divided in two parts, 13221 and 603, that added together give a cube (13824 = 24³).

The spelling of 13221603 in words is "thirteen million, two hundred twenty-one thousand, six hundred three".