221237189 has 8 divisors (see below), whose sum is σ = 226860480. Its totient is φ = 215624800.

The previous prime is 221237183. The next prime is 221237221. The reversal of 221237189 is 981732122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 221237189 - 2²⁰ = 220188613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221237183) 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, 52034 + ... + 56124.

It is an arithmetic number, because the mean of its divisors is an integer number (28357560).

Almost surely, 2^221237189 is an apocalyptic number.

It is an amenable number.

221237189 is a deficient number, since it is larger than the sum of its proper divisors (5623291).

221237189 is a wasteful number, since it uses less digits than its factorization.

221237189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5451.

The product of its digits is 12096, while the sum is 35.

The square root of 221237189 is about 14874.0441373555. The cubic root of 221237189 is about 604.8105765839.

The spelling of 221237189 in words is "two hundred twenty-one million, two hundred thirty-seven thousand, one hundred eighty-nine".