13221604 has 12 divisors (see below), whose sum is σ = 25241328. Its totient is φ = 6009800.

The previous prime is 13221599. The next prime is 13221623. The reversal of 13221604 is 40612231.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 150202 + ... + 150289.

It is an arithmetic number, because the mean of its divisors is an integer number (2103444).

Almost surely, 2^13221604 is an apocalyptic number.

It is an amenable number.

13221604 is a deficient number, since it is larger than the sum of its proper divisors (12019724).

13221604 is a wasteful number, since it uses less digits than its factorization.

13221604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 300506 (or 300504 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 13221604 is about 3636.1523620443. The cubic root of 13221604 is about 236.4620126803.

Adding to 13221604 its reverse (40612231), we get a palindrome (53833835).

It can be divided in two parts, 1322 and 1604, that added together give a triangular number (2926 = T₇₆).

The spelling of 13221604 in words is "thirteen million, two hundred twenty-one thousand, six hundred four".