12221646 has 8 divisors (see below), whose sum is σ = 24443304. Its totient is φ = 4073880.

The previous prime is 12221611. The next prime is 12221669. The reversal of 12221646 is 64612221.

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

12221646 is an admirable number.

It is a congruent 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, 1018465 + ... + 1018476.

It is an arithmetic number, because the mean of its divisors is an integer number (3055413).

Almost surely, 2^12221646 is an apocalyptic number.

12221646 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12221646 is a wasteful number, since it uses less digits than its factorization.

12221646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2036946.

The product of its digits is 1152, while the sum is 24.

The square root of 12221646 is about 3495.9470819794. The cubic root of 12221646 is about 230.3438209985.

Adding to 12221646 its reverse (64612221), we get a palindrome (76833867).

The spelling of 12221646 in words is "twelve million, two hundred twenty-one thousand, six hundred forty-six".