12532221 has 48 divisors (see below), whose sum is σ = 20756736. Its totient is φ = 7233408.

The previous prime is 12532199. The next prime is 12532237. The reversal of 12532221 is 12223521.

It is not a de Polignac number, because 12532221 - 2⁵ = 12532189 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12532194 and 12532203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12532271) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 236431 + ... + 236483.

It is an arithmetic number, because the mean of its divisors is an integer number (432432).

Almost surely, 2^12532221 is an apocalyptic number.

It is an amenable number.

12532221 is a deficient number, since it is larger than the sum of its proper divisors (8224515).

12532221 is a wasteful number, since it uses less digits than its factorization.

12532221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162 (or 159 counting only the distinct ones).

The product of its digits is 240, while the sum is 18.

The square root of 12532221 is about 3540.0877107778. The cubic root of 12532221 is about 232.2786794333.

Adding to 12532221 its reverse (12223521), we get a palindrome (24755742).

The spelling of 12532221 in words is "twelve million, five hundred thirty-two thousand, two hundred twenty-one".