12220447 has 2 divisors, whose sum is σ = 12220448. Its totient is φ = 12220446.

The previous prime is 12220441. The next prime is 12220451. The reversal of 12220447 is 74402221.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (74402221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12220447 - 2¹⁹ = 11696159 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12220441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6110223 + 6110224.

It is an arithmetic number, because the mean of its divisors is an integer number (6110224).

Almost surely, 2^12220447 is an apocalyptic number.

12220447 is a deficient number, since it is larger than the sum of its proper divisors (1).

12220447 is an equidigital number, since it uses as much as digits as its factorization.

12220447 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 896, while the sum is 22.

The square root of 12220447 is about 3495.7755934842. The cubic root of 12220447 is about 230.3362881541.

Adding to 12220447 its reverse (74402221), we get a palindrome (86622668).

The spelling of 12220447 in words is "twelve million, two hundred twenty thousand, four hundred forty-seven".