221799312512 has 24 divisors (see below), whose sum is σ = 441876433035. Its totient is φ = 110896992128.

The previous prime is 221799312499. The next prime is 221799312541. The reversal of 221799312512 is 215213997122.

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 only one way, i.e., 110899656256 + 110899656256 = 333016^2 + 333016^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=333016.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 5307443 + ... + 5349069.

Almost surely, 2^221799312512 is an apocalyptic number.

It is an amenable number.

221799312512 is a deficient number, since it is larger than the sum of its proper divisors (220077120523).

221799312512 is an frugal number, since it uses more digits than its factorization.

221799312512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83268 (or 41629 counting only the distinct ones).

The product of its digits is 136080, while the sum is 44.

The spelling of 221799312512 in words is "two hundred twenty-one billion, seven hundred ninety-nine million, three hundred twelve thousand, five hundred twelve".