12210805 has 8 divisors (see below), whose sum is σ = 14671800. Its totient is φ = 9756096.

The previous prime is 12210791. The next prime is 12210823. The reversal of 12210805 is 50801221.

12210805 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 142129 + 12068676 = 377^2 + 3474^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12210805 - 2⁵ = 12210773 is a prime.

It is a congruent number.

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 in 7 ways as a sum of consecutive naturals, for example, 6291 + ... + 7999.

It is an arithmetic number, because the mean of its divisors is an integer number (1833975).

Almost surely, 2^12210805 is an apocalyptic number.

It is an amenable number.

12210805 is a deficient number, since it is larger than the sum of its proper divisors (2460995).

12210805 is a wasteful number, since it uses less digits than its factorization.

12210805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3143.

The product of its (nonzero) digits is 160, while the sum is 19.

The square root of 12210805 is about 3494.3962282489. The cubic root of 12210805 is about 230.2756933481.

The spelling of 12210805 in words is "twelve million, two hundred ten thousand, eight hundred five".