12211447 has 2 divisors, whose sum is σ = 12211448. Its totient is φ = 12211446.

The previous prime is 12211421. The next prime is 12211469. The reversal of 12211447 is 74411221.

It is an a-pointer prime, because the next prime (12211469) can be obtained adding 12211447 to its sum of digits (22).

It is a strong prime.

It is an emirp because it is prime and its reverse (74411221) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12211447 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12211477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6105723 + 6105724.

It is an arithmetic number, because the mean of its divisors is an integer number (6105724).

Almost surely, 2^12211447 is an apocalyptic number.

12211447 is a deficient number, since it is larger than the sum of its proper divisors (1).

12211447 is an equidigital number, since it uses as much as digits as its factorization.

12211447 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 448, while the sum is 22.

The square root of 12211447 is about 3494.4880884044. The cubic root of 12211447 is about 230.2797289653.

Adding to 12211447 its reverse (74411221), we get a palindrome (86622668).

The spelling of 12211447 in words is "twelve million, two hundred eleven thousand, four hundred forty-seven".