13132221 has 4 divisors (see below), whose sum is σ = 17509632. Its totient is φ = 8754812.

The previous prime is 13132219. The next prime is 13132237. The reversal of 13132221 is 12223131.

13132221 is digitally balanced in base 2 and base 4, because in such bases 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: 12223131 = 3 ⋅4074377.

It is a cyclic number.

It is not a de Polignac number, because 13132221 - 2¹ = 13132219 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13132221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13132261) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2188701 + ... + 2188706.

It is an arithmetic number, because the mean of its divisors is an integer number (4377408).

Almost surely, 2^13132221 is an apocalyptic number.

It is an amenable number.

13132221 is a deficient number, since it is larger than the sum of its proper divisors (4377411).

13132221 is an equidigital number, since it uses as much as digits as its factorization.

13132221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4377410.

The product of its digits is 72, while the sum is 15.

The square root of 13132221 is about 3623.8406421917. The cubic root of 13132221 is about 235.9279500922.

Adding to 13132221 its reverse (12223131), we get a palindrome (25355352).

The spelling of 13132221 in words is "thirteen million, one hundred thirty-two thousand, two hundred twenty-one".