13221623 has 2 divisors, whose sum is σ = 13221624. Its totient is φ = 13221622.

The previous prime is 13221599. The next prime is 13221629. The reversal of 13221623 is 32612231.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (32612231) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13221623 is a prime.

It is a super-2 number, since 2×13221623² = 349622629508258, which contains 22 as substring.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 13221595 and 13221604.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13221629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6610811 + 6610812.

It is an arithmetic number, because the mean of its divisors is an integer number (6610812).

Almost surely, 2^13221623 is an apocalyptic number.

13221623 is a deficient number, since it is larger than the sum of its proper divisors (1).

13221623 is an equidigital number, since it uses as much as digits as its factorization.

13221623 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 432, while the sum is 20.

The square root of 13221623 is about 3636.1549746951. The cubic root of 13221623 is about 236.4621259489.

Adding to 13221623 its reverse (32612231), we get a palindrome (45833854).

The spelling of 13221623 in words is "thirteen million, two hundred twenty-one thousand, six hundred twenty-three".