12213817 has 8 divisors (see below), whose sum is σ = 15227712. Its totient is φ = 9517200.

The previous prime is 12213809. The next prime is 12213821. The reversal of 12213817 is 71831221.

It is a happy number.

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

It is not a de Polignac number, because 12213817 - 2³ = 12213809 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12213791 and 12213800.

It is not an unprimeable number, because it can be changed into a prime (12213857) 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, 79234 + ... + 79387.

It is an arithmetic number, because the mean of its divisors is an integer number (1903464).

Almost surely, 2^12213817 is an apocalyptic number.

It is an amenable number.

12213817 is a deficient number, since it is larger than the sum of its proper divisors (3013895).

12213817 is a wasteful number, since it uses less digits than its factorization.

12213817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158639.

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

The square root of 12213817 is about 3494.8271774152. The cubic root of 12213817 is about 230.2946255797.

The spelling of 12213817 in words is "twelve million, two hundred thirteen thousand, eight hundred seventeen".