12216955 has 16 divisors (see below), whose sum is σ = 15016320. Its totient is φ = 9539712.

The previous prime is 12216949. The next prime is 12216959. The reversal of 12216955 is 55961221.

It is a cyclic number.

It is not a de Polignac number, because 12216955 - 2³ = 12216947 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12216959) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61917 + ... + 62113.

It is an arithmetic number, because the mean of its divisors is an integer number (938520).

Almost surely, 2^12216955 is an apocalyptic number.

12216955 is a deficient number, since it is larger than the sum of its proper divisors (2799365).

12216955 is a wasteful number, since it uses less digits than its factorization.

12216955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 438.

The product of its digits is 5400, while the sum is 31.

The square root of 12216955 is about 3495.2760978212. The cubic root of 12216955 is about 230.3143464869.

The spelling of 12216955 in words is "twelve million, two hundred sixteen thousand, nine hundred fifty-five".