132521221 has 4 divisors (see below), whose sum is σ = 151452832. Its totient is φ = 113589612.

The previous prime is 132521201. The next prime is 132521231. The reversal of 132521221 is 122125231.

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.

It is a cyclic number.

It is not a de Polignac number, because 132521221 - 2¹¹ = 132519173 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (132521201) 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, 9465795 + ... + 9465808.

It is an arithmetic number, because the mean of its divisors is an integer number (37863208).

Almost surely, 2^132521221 is an apocalyptic number.

It is an amenable number.

132521221 is a deficient number, since it is larger than the sum of its proper divisors (18931611).

132521221 is an equidigital number, since it uses as much as digits as its factorization.

132521221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18931610.

The product of its digits is 240, while the sum is 19.

The square root of 132521221 is about 11511.7861776529. The cubic root of 132521221 is about 509.8336263667.

Adding to 132521221 its reverse (122125231), we get a palindrome (254646452).

The spelling of 132521221 in words is "one hundred thirty-two million, five hundred twenty-one thousand, two hundred twenty-one".