12220661 has 2 divisors, whose sum is σ = 12220662. Its totient is φ = 12220660.

The previous prime is 12220657. The next prime is 12220669. The reversal of 12220661 is 16602221.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11771761 + 448900 = 3431^2 + 670^2 .

It is a cyclic number.

It is not a de Polignac number, because 12220661 - 2² = 12220657 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12220669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6110330 + 6110331.

It is an arithmetic number, because the mean of its divisors is an integer number (6110331).

Almost surely, 2^12220661 is an apocalyptic number.

It is an amenable number.

12220661 is a deficient number, since it is larger than the sum of its proper divisors (1).

12220661 is an equidigital number, since it uses as much as digits as its factorization.

12220661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 12220661 is about 3495.8062017223. The cubic root of 12220661 is about 230.3376326679.

Adding to 12220661 its reverse (16602221), we get a palindrome (28822882).

The spelling of 12220661 in words is "twelve million, two hundred twenty thousand, six hundred sixty-one".