221382189 has 48 divisors (see below), whose sum is σ = 379551744. Its totient is φ = 121716000.

The previous prime is 221382181. The next prime is 221382193. The reversal of 221382189 is 981283122.

It is not a de Polignac number, because 221382189 - 2³ = 221382181 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221382181) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 191764 + ... + 192914.

It is an arithmetic number, because the mean of its divisors is an integer number (7907328).

Almost surely, 2^221382189 is an apocalyptic number.

It is an amenable number.

221382189 is a deficient number, since it is larger than the sum of its proper divisors (158169555).

221382189 is a wasteful number, since it uses less digits than its factorization.

221382189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1278 (or 1275 counting only the distinct ones).

The product of its digits is 13824, while the sum is 36.

The square root of 221382189 is about 14878.9176017612. The cubic root of 221382189 is about 604.9426797230.

The spelling of 221382189 in words is "two hundred twenty-one million, three hundred eighty-two thousand, one hundred eighty-nine".