12216061721 has 8 divisors (see below), whose sum is σ = 12299709888. Its totient is φ = 12132450000.

The previous prime is 12216061709. The next prime is 12216061771. The reversal of 12216061721 is 12716061221.

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

It is a cyclic number.

It is not a de Polignac number, because 12216061721 - 2¹⁴ = 12216045337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12216061771) 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, 1228871 + ... + 1238771.

It is an arithmetic number, because the mean of its divisors is an integer number (1537463736).

Almost surely, 2^12216061721 is an apocalyptic number.

It is an amenable number.

12216061721 is a deficient number, since it is larger than the sum of its proper divisors (83648167).

12216061721 is an equidigital number, since it uses as much as digits as its factorization.

12216061721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18223.

The product of its (nonzero) digits is 2016, while the sum is 29.

The spelling of 12216061721 in words is "twelve billion, two hundred sixteen million, sixty-one thousand, seven hundred twenty-one".