12221644 has 12 divisors (see below), whose sum is σ = 22125600. Its totient is φ = 5900048.

The previous prime is 12221611. The next prime is 12221669. The reversal of 12221644 is 44612221.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52564 + ... + 52795.

It is an arithmetic number, because the mean of its divisors is an integer number (1843800).

Almost surely, 2^12221644 is an apocalyptic number.

It is an amenable number.

12221644 is a deficient number, since it is larger than the sum of its proper divisors (9903956).

12221644 is a wasteful number, since it uses less digits than its factorization.

12221644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105392 (or 105390 counting only the distinct ones).

The product of its digits is 768, while the sum is 22.

The square root of 12221644 is about 3495.9467959338. The cubic root of 12221644 is about 230.3438084337.

Adding to 12221644 its reverse (44612221), we get a palindrome (56833865).

The spelling of 12221644 in words is "twelve million, two hundred twenty-one thousand, six hundred forty-four".