221730238 has 8 divisors (see below), whose sum is σ = 334087488. Its totient is φ = 110367744.

The previous prime is 221730227. The next prime is 221730241. The reversal of 221730238 is 832037122.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 248131 + ... + 249022.

It is an arithmetic number, because the mean of its divisors is an integer number (41760936).

Almost surely, 2^221730238 is an apocalyptic number.

221730238 is a deficient number, since it is larger than the sum of its proper divisors (112357250).

221730238 is a wasteful number, since it uses less digits than its factorization.

221730238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 497378.

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 221730238 is about 14890.6090540313. The cubic root of 221730238 is about 605.2595366668.

The spelling of 221730238 in words is "two hundred twenty-one million, seven hundred thirty thousand, two hundred thirty-eight".