12132221 has 4 divisors (see below), whose sum is σ = 12252444. Its totient is φ = 12012000.

The previous prime is 12132217. The next prime is 12132223. The reversal of 12132221 is 12223121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12223121 = 101 ⋅121021.

It can be written as a sum of positive squares in 2 ways, for example, as 10725625 + 1406596 = 3275^2 + 1186^2 .

It is a cyclic number.

It is not a de Polignac number, because 12132221 - 2² = 12132217 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12132196 and 12132205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12132223) 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, 59960 + ... + 60161.

It is an arithmetic number, because the mean of its divisors is an integer number (3063111).

Almost surely, 2^12132221 is an apocalyptic number.

It is an amenable number.

12132221 is a deficient number, since it is larger than the sum of its proper divisors (120223).

12132221 is a wasteful number, since it uses less digits than its factorization.

12132221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120222.

The product of its digits is 48, while the sum is 14.

The square root of 12132221 is about 3483.1337901378. The cubic root of 12132221 is about 229.7806415188.

Adding to 12132221 its reverse (12223121), we get a palindrome (24355342).

The spelling of 12132221 in words is "twelve million, one hundred thirty-two thousand, two hundred twenty-one".