12221720604 has 18 divisors (see below), whose sum is σ = 30893793840. Its totient is φ = 4073906856.

The previous prime is 12221720579. The next prime is 12221720653. The reversal of 12221720604 is 40602712221.

12221720604 is a `hidden beast` number, since 1 + 2 + 22 + 17 + 20 + 604 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 169746084 + ... + 169746155.

It is an arithmetic number, because the mean of its divisors is an integer number (1716321880).

Almost surely, 2^12221720604 is an apocalyptic number.

It is an amenable number.

12221720604 is an abundant number, since it is smaller than the sum of its proper divisors (18672073236).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12221720604 is a wasteful number, since it uses less digits than its factorization.

12221720604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 339492249 (or 339492244 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The spelling of 12221720604 in words is "twelve billion, two hundred twenty-one million, seven hundred twenty thousand, six hundred four".