221837189 has 8 divisors (see below), whose sum is σ = 255353280. Its totient is φ = 188777376.

The previous prime is 221837173. The next prime is 221837207. The reversal of 221837189 is 981738122.

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 221837189 - 2⁴ = 221837173 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221837159) 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, 113024 + ... + 114969.

It is an arithmetic number, because the mean of its divisors is an integer number (31919160).

Almost surely, 2^221837189 is an apocalyptic number.

It is an amenable number.

221837189 is a deficient number, since it is larger than the sum of its proper divisors (33516091).

221837189 is a wasteful number, since it uses less digits than its factorization.

221837189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228139.

The product of its digits is 48384, while the sum is 41.

The square root of 221837189 is about 14894.1998442347. The cubic root of 221837189 is about 605.3568361423.

The spelling of 221837189 in words is "two hundred twenty-one million, eight hundred thirty-seven thousand, one hundred eighty-nine".