12216005817 has 4 divisors (see below), whose sum is σ = 16288007760. Its totient is φ = 8144003876.

The previous prime is 12216005807. The next prime is 12216005821. The reversal of 12216005817 is 71850061221.

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 12216005817 - 2¹⁰ = 12216004793 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12216005807) 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, 2036000967 + ... + 2036000972.

It is an arithmetic number, because the mean of its divisors is an integer number (4072001940).

Almost surely, 2^12216005817 is an apocalyptic number.

It is an amenable number.

12216005817 is a deficient number, since it is larger than the sum of its proper divisors (4072001943).

12216005817 is an equidigital number, since it uses as much as digits as its factorization.

12216005817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4072001942.

The product of its (nonzero) digits is 6720, while the sum is 33.

The spelling of 12216005817 in words is "twelve billion, two hundred sixteen million, five thousand, eight hundred seventeen".