12205971 has 20 divisors (see below), whose sum is σ = 18825664. Its totient is φ = 7873200.

The previous prime is 12205957. The next prime is 12205981. The reversal of 12205971 is 17950221.

It is a de Polignac number, because none of the positive numbers 2^k-12205971 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12205901) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 81 + ... + 4941.

Almost surely, 2^12205971 is an apocalyptic number.

12205971 is a deficient number, since it is larger than the sum of its proper divisors (6619693).

12205971 is an equidigital number, since it uses as much as digits as its factorization.

12205971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4904 (or 4895 counting only the distinct ones).

The product of its (nonzero) digits is 1260, while the sum is 27.

The square root of 12205971 is about 3493.7044809199. The cubic root of 12205971 is about 230.2453022416.

The spelling of 12205971 in words is "twelve million, two hundred five thousand, nine hundred seventy-one".