12217676721 has 16 divisors (see below), whose sum is σ = 16351634688. Its totient is φ = 8114461200.

The previous prime is 12217676717. The next prime is 12217676789. The reversal of 12217676721 is 12767671221.

It is not a de Polignac number, because 12217676721 - 2² = 12217676717 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12217676701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1339386 + ... + 1348476.

It is an arithmetic number, because the mean of its divisors is an integer number (1021977168).

Almost surely, 2^12217676721 is an apocalyptic number.

It is an amenable number.

12217676721 is a deficient number, since it is larger than the sum of its proper divisors (4133957967).

12217676721 is a wasteful number, since it uses less digits than its factorization.

12217676721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10732.

The product of its digits is 98784, while the sum is 42.

The spelling of 12217676721 in words is "twelve billion, two hundred seventeen million, six hundred seventy-six thousand, seven hundred twenty-one".