12216815 has 8 divisors (see below), whose sum is σ = 15787968. Its totient is φ = 9021600.

The previous prime is 12216803. The next prime is 12216817. The reversal of 12216815 is 51861221.

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

It is not a de Polignac number, because 12216815 - 2⁶ = 12216751 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 (12216817) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 93911 + ... + 94040.

It is an arithmetic number, because the mean of its divisors is an integer number (1973496).

Almost surely, 2^12216815 is an apocalyptic number.

12216815 is a deficient number, since it is larger than the sum of its proper divisors (3571153).

12216815 is a wasteful number, since it uses less digits than its factorization.

12216815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187969.

The product of its digits is 960, while the sum is 26.

The square root of 12216815 is about 3495.2560707336. The cubic root of 12216815 is about 230.3134667224.

It can be divided in two parts, 12216 and 815, that added together give a palindrome (13031).

The spelling of 12216815 in words is "twelve million, two hundred sixteen thousand, eight hundred fifteen".