13321636 has 6 divisors (see below), whose sum is σ = 23312870. Its totient is φ = 6660816.

The previous prime is 13321619. The next prime is 13321639. The reversal of 13321636 is 63612331.

It can be written as a sum of positive squares in only one way, i.e., 9734400 + 3587236 = 3120^2 + 1894^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 13321636.

It is not an unprimeable number, because it can be changed into a prime (13321639) 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, 1665201 + ... + 1665208.

Almost surely, 2^13321636 is an apocalyptic number.

It is an amenable number.

13321636 is a deficient number, since it is larger than the sum of its proper divisors (9991234).

13321636 is a wasteful number, since it uses less digits than its factorization.

13321636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3330413 (or 3330411 counting only the distinct ones).

The product of its digits is 1944, while the sum is 25.

The square root of 13321636 is about 3649.8816419166. The cubic root of 13321636 is about 237.0568564000.

Adding to 13321636 its reverse (63612331), we get a palindrome (76933967).

The spelling of 13321636 in words is "thirteen million, three hundred twenty-one thousand, six hundred thirty-six".