12221641 has 4 divisors (see below), whose sum is σ = 12452292. Its totient is φ = 11990992.

The previous prime is 12221611. The next prime is 12221669. The reversal of 12221641 is 14612221.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10791225 + 1430416 = 3285^2 + 1196^2 .

It is a cyclic number.

It is not a de Polignac number, because 12221641 - 2¹¹ = 12219593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12221611) 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, 115246 + ... + 115351.

It is an arithmetic number, because the mean of its divisors is an integer number (3113073).

Almost surely, 2^12221641 is an apocalyptic number.

It is an amenable number.

12221641 is a deficient number, since it is larger than the sum of its proper divisors (230651).

12221641 is an equidigital number, since it uses as much as digits as its factorization.

12221641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230650.

The product of its digits is 192, while the sum is 19.

The square root of 12221641 is about 3495.9463668655. The cubic root of 12221641 is about 230.3437895865.

Adding to 12221641 its reverse (14612221), we get a palindrome (26833862).

The spelling of 12221641 in words is "twelve million, two hundred twenty-one thousand, six hundred forty-one".