12217813 has 4 divisors (see below), whose sum is σ = 12611968. Its totient is φ = 11823660.

The previous prime is 12217811. The next prime is 12217859. The reversal of 12217813 is 31871221.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12217813 - 2¹ = 12217811 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12217811) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 197031 + ... + 197092.

It is an arithmetic number, because the mean of its divisors is an integer number (3152992).

Almost surely, 2^12217813 is an apocalyptic number.

It is an amenable number.

12217813 is a deficient number, since it is larger than the sum of its proper divisors (394155).

12217813 is an equidigital number, since it uses as much as digits as its factorization.

12217813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 394154.

The product of its digits is 672, while the sum is 25.

The square root of 12217813 is about 3495.3988327514. The cubic root of 12217813 is about 230.3197380400.

The spelling of 12217813 in words is "twelve million, two hundred seventeen thousand, eight hundred thirteen".