12213816 has 16 divisors (see below), whose sum is σ = 30534600. Its totient is φ = 4071264.

The previous prime is 12213809. The next prime is 12213821. The reversal of 12213816 is 61831221.

It is a Harshad number since it is a multiple of its sum of digits (24), and also a Moran number because the ratio is a prime number: 508909 = 12213816 / (1 + 2 + 2 + 1 + 3 + 8 + 1 + 6).

It is a nude number because it is divisible by every one of its digits.

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 3 ways as a sum of consecutive naturals, for example, 254431 + ... + 254478.

Almost surely, 2^12213816 is an apocalyptic number.

It is an amenable number.

12213816 is an abundant number, since it is smaller than the sum of its proper divisors (18320784).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12213816 is a wasteful number, since it uses less digits than its factorization.

12213816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 508918 (or 508914 counting only the distinct ones).

The product of its digits is 576, while the sum is 24.

The square root of 12213816 is about 3494.8270343466. The cubic root of 12213816 is about 230.2946192947.

The spelling of 12213816 in words is "twelve million, two hundred thirteen thousand, eight hundred sixteen".