12220261 has 2 divisors, whose sum is σ = 12220262. Its totient is φ = 12220260.

The previous prime is 12220259. The next prime is 12220267. The reversal of 12220261 is 16202221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9641025 + 2579236 = 3105^2 + 1606^2 .

It is a cyclic number.

It is not a de Polignac number, because 12220261 - 2¹ = 12220259 is a prime.

Together with 12220259, it forms a pair of twin primes.

It is a nialpdrome in base 16.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12220267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6110130 + 6110131.

It is an arithmetic number, because the mean of its divisors is an integer number (6110131).

Almost surely, 2^12220261 is an apocalyptic number.

It is an amenable number.

12220261 is a deficient number, since it is larger than the sum of its proper divisors (1).

12220261 is an equidigital number, since it uses as much as digits as its factorization.

12220261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 12220261 is about 3495.7489898447. The cubic root of 12220261 is about 230.3351195453.

Adding to 12220261 its reverse (16202221), we get a palindrome (28422482).

The spelling of 12220261 in words is "twelve million, two hundred twenty thousand, two hundred sixty-one".