221399873312 has 54 divisors (see below), whose sum is σ = 439021381617. Its totient is φ = 109908072576.

The previous prime is 221399873293. The next prime is 221399873329. The reversal of 221399873312 is 213378993122.

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 2 ways, for example, as 220978967056 + 420906256 = 470084^2 + 20516^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=332716.

It is a Smith number, since the sum of its digits (50) coincides with the sum of the digits of its prime factors.

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, 593565158 + ... + 593565530.

Almost surely, 2^221399873312 is an apocalyptic number.

It is an amenable number.

221399873312 is a deficient number, since it is larger than the sum of its proper divisors (217621508305).

221399873312 is an frugal number, since it uses more digits than its factorization.

221399873312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1202 (or 598 counting only the distinct ones).

The product of its digits is 979776, while the sum is 50.

Multiplying 221399873312 by its sum of digits (50), we get a square (11069993665600 = 3327160²).

The spelling of 221399873312 in words is "two hundred twenty-one billion, three hundred ninety-nine million, eight hundred seventy-three thousand, three hundred twelve".