12221161 has 8 divisors (see below), whose sum is σ = 13280000. Its totient is φ = 11203920.

The previous prime is 12221117. The next prime is 12221171. The reversal of 12221161 is 16112221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-12221161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12221171) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9786 + ... + 10963.

It is an arithmetic number, because the mean of its divisors is an integer number (1660000).

Almost surely, 2^12221161 is an apocalyptic number.

It is an amenable number.

12221161 is a deficient number, since it is larger than the sum of its proper divisors (1058839).

12221161 is a wasteful number, since it uses less digits than its factorization.

12221161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20799.

The product of its digits is 48, while the sum is 16.

The square root of 12221161 is about 3495.8777152526. The cubic root of 12221161 is about 230.3407739940.

Adding to 12221161 its reverse (16112221), we get a palindrome (28333382).

The spelling of 12221161 in words is "twelve million, two hundred twenty-one thousand, one hundred sixty-one".