12217508641813 has 4 divisors (see below), whose sum is σ = 12477455634240. Its totient is φ = 11957561649388.

The previous prime is 12217508641801. The next prime is 12217508641823. The reversal of 12217508641813 is 31814680571221.

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 12217508641813 - 2²⁹ = 12216971770901 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 (12217508641823) 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, 129973496143 + ... + 129973496236.

It is an arithmetic number, because the mean of its divisors is an integer number (3119363908560).

Almost surely, 2^{12217508641813} is an apocalyptic number.

It is an amenable number.

12217508641813 is a deficient number, since it is larger than the sum of its proper divisors (259946992427).

12217508641813 is an equidigital number, since it uses as much as digits as its factorization.

12217508641813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 259946992426.

The product of its (nonzero) digits is 645120, while the sum is 49.

The spelling of 12217508641813 in words is "twelve trillion, two hundred seventeen billion, five hundred eight million, six hundred forty-one thousand, eight hundred thirteen".