221599547912 has 36 divisors (see below), whose sum is σ = 418681278855. Its totient is φ = 109957622976.

The previous prime is 221599547809. The next prime is 221599547933. The reversal of 221599547912 is 219745995122.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in 5 ways, for example, as 10942415236 + 210657132676 = 104606^2 + 458974^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=332866.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 198387578 + ... + 198388694.

Almost surely, 2^221599547912 is an apocalyptic number.

It is an amenable number.

221599547912 is a deficient number, since it is larger than the sum of its proper divisors (197081730943).

221599547912 is an frugal number, since it uses more digits than its factorization.

221599547912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2538 (or 1268 counting only the distinct ones).

The product of its digits is 4082400, while the sum is 56.

The spelling of 221599547912 in words is "two hundred twenty-one billion, five hundred ninety-nine million, five hundred forty-seven thousand, nine hundred twelve".