221660382 has 16 divisors (see below), whose sum is σ = 469398672. Its totient is φ = 69540480.

The previous prime is 221660347. The next prime is 221660389. The reversal of 221660382 is 283066122.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221660389) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1086469 + ... + 1086672.

It is an arithmetic number, because the mean of its divisors is an integer number (29337417).

Almost surely, 2^221660382 is an apocalyptic number.

221660382 is an abundant number, since it is smaller than the sum of its proper divisors (247738290).

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

221660382 is a wasteful number, since it uses less digits than its factorization.

221660382 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2173163.

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 221660382 is about 14888.2632298062. The cubic root of 221660382 is about 605.1959677530.

The spelling of 221660382 in words is "two hundred twenty-one million, six hundred sixty thousand, three hundred eighty-two".