12117252721 has 8 divisors (see below), whose sum is σ = 13855705344. Its totient is φ = 10380654240.

The previous prime is 12117252691. The next prime is 12117252739. The reversal of 12117252721 is 12725271121.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12117252721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12117252761) 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, 449500 + ... + 475693.

It is an arithmetic number, because the mean of its divisors is an integer number (1731963168).

Almost surely, 2^12117252721 is an apocalyptic number.

It is an amenable number.

12117252721 is a deficient number, since it is larger than the sum of its proper divisors (1738452623).

12117252721 is an equidigital number, since it uses as much as digits as its factorization.

12117252721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 927071.

The product of its digits is 3920, while the sum is 31.

The spelling of 12117252721 in words is "twelve billion, one hundred seventeen million, two hundred fifty-two thousand, seven hundred twenty-one".