13133221 has 4 divisors (see below), whose sum is σ = 13260832. Its totient is φ = 13005612.

The previous prime is 13133213. The next prime is 13133233. The reversal of 13133221 is 12233131.

13133221 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12233131 = 19 ⋅643849.

It is a cyclic number.

It is not a de Polignac number, because 13133221 - 2³ = 13133213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13133195 and 13133204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13133291) 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 in 3 ways as a sum of consecutive naturals, for example, 63651 + ... + 63856.

It is an arithmetic number, because the mean of its divisors is an integer number (3315208).

Almost surely, 2^13133221 is an apocalyptic number.

It is an amenable number.

13133221 is a deficient number, since it is larger than the sum of its proper divisors (127611).

13133221 is a wasteful number, since it uses less digits than its factorization.

13133221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127610.

The product of its digits is 108, while the sum is 16.

The square root of 13133221 is about 3623.9786147272. The cubic root of 13133221 is about 235.9339384665.

Adding to 13133221 its reverse (12233131), we get a palindrome (25366352).

The spelling of 13133221 in words is "thirteen million, one hundred thirty-three thousand, two hundred twenty-one".