12205771 has 6 divisors (see below), whose sum is σ = 12882372. Its totient is φ = 11563020.

The previous prime is 12205757. The next prime is 12205777. The reversal of 12205771 is 17750221.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-12205771 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12205777) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 16545 + ... + 17266.

It is an arithmetic number, because the mean of its divisors is an integer number (2147062).

Almost surely, 2^12205771 is an apocalyptic number.

12205771 is a deficient number, since it is larger than the sum of its proper divisors (676601).

12205771 is an equidigital number, since it uses as much as digits as its factorization.

12205771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33849 (or 33830 counting only the distinct ones).

The product of its (nonzero) digits is 980, while the sum is 25.

The square root of 12205771 is about 3493.6758578895. The cubic root of 12205771 is about 230.2440446791.

Adding to 12205771 its reverse (17750221), we get a palindrome (29955992).

The spelling of 12205771 in words is "twelve million, two hundred five thousand, seven hundred seventy-one".