13403221 has 6 divisors (see below), whose sum is σ = 14513730. Its totient is φ = 12372048.

The previous prime is 13403209. The next prime is 13403233. The reversal of 13403221 is 12230431.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (13403209) and next prime (13403233).

It can be written as a sum of positive squares in 3 ways, for example, as 722500 + 12680721 = 850^2 + 3561^2 .

It is not a de Polignac number, because 13403221 - 2⁹ = 13402709 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13403195 and 13403204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13403251) 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, 39486 + ... + 39823.

It is an arithmetic number, because the mean of its divisors is an integer number (2418955).

Almost surely, 2^13403221 is an apocalyptic number.

It is an amenable number.

13403221 is a deficient number, since it is larger than the sum of its proper divisors (1110509).

13403221 is an equidigital number, since it uses as much as digits as its factorization.

13403221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79335 (or 79322 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 13403221 is about 3661.0409721826. The cubic root of 13403221 is about 237.5398034858.

Adding to 13403221 its reverse (12230431), we get a palindrome (25633652).

The spelling of 13403221 in words is "thirteen million, four hundred three thousand, two hundred twenty-one".