221579201284 has 27 divisors (see below), whose sum is σ = 451085361447. Its totient is φ = 94959690504.

The previous prime is 221579201251. The next prime is 221579201287. The reversal of 221579201284 is 482102975122.

The square root of 221579201284 is 470722.

It is a perfect power (a square), and thus also a powerful number.

221579201284 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 221579201284.

It is not an unprimeable number, because it can be changed into a prime (221579201287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 6573297 + ... + 6606919.

Almost surely, 2^221579201284 is an apocalyptic number.

221579201284 is the 470722-nd square number.

It is an amenable number.

221579201284 is an abundant number, since it is smaller than the sum of its proper divisors (229506160163).

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

221579201284 is an frugal number, since it uses more digits than its factorization.

221579201284 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67264 (or 33632 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 43.

The spelling of 221579201284 in words is "two hundred twenty-one billion, five hundred seventy-nine million, two hundred one thousand, two hundred eighty-four".