12228647921 has 8 divisors (see below), whose sum is σ = 14212472640. Its totient is φ = 10304041968.

The previous prime is 12228647917. The next prime is 12228647939. The reversal of 12228647921 is 12974682221.

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 12228647921 - 2² = 12228647917 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12228667921) 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 7 ways as a sum of consecutive naturals, for example, 14804246 + ... + 14805071.

It is an arithmetic number, because the mean of its divisors is an integer number (1776559080).

Almost surely, 2^12228647921 is an apocalyptic number.

It is an amenable number.

12228647921 is a deficient number, since it is larger than the sum of its proper divisors (1983824719).

12228647921 is an equidigital number, since it uses as much as digits as its factorization.

12228647921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29609383.

The product of its digits is 193536, while the sum is 44.

The spelling of 12228647921 in words is "twelve billion, two hundred twenty-eight million, six hundred forty-seven thousand, nine hundred twenty-one".