12217256 has 8 divisors (see below), whose sum is σ = 22907370. Its totient is φ = 6108624.

The previous prime is 12217241. The next prime is 12217277. The reversal of 12217256 is 65271221.

It can be written as a sum of positive squares in only one way, i.e., 8352100 + 3865156 = 2890^2 + 1966^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×12217256² = 298522688339072, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 763571 + ... + 763586.

Almost surely, 2^12217256 is an apocalyptic number.

It is an amenable number.

12217256 is a deficient number, since it is larger than the sum of its proper divisors (10690114).

12217256 is a wasteful number, since it uses less digits than its factorization.

12217256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1527163 (or 1527159 counting only the distinct ones).

The product of its digits is 1680, while the sum is 26.

The square root of 12217256 is about 3495.3191556709. The cubic root of 12217256 is about 230.3162379579.

Adding to 12217256 its reverse (65271221), we get a palindrome (77488477).

The spelling of 12217256 in words is "twelve million, two hundred seventeen thousand, two hundred fifty-six".