221742321 has 8 divisors (see below), whose sum is σ = 296325600. Its totient is φ = 147493632.

The previous prime is 221742319. The next prime is 221742337. The reversal of 221742321 is 123247122.

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

It is not a de Polignac number, because 221742321 - 2¹ = 221742319 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221742291 and 221742300.

It is not an unprimeable number, because it can be changed into a prime (221742361) 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, 82096 + ... + 84753.

It is an arithmetic number, because the mean of its divisors is an integer number (37040700).

Almost surely, 2^221742321 is an apocalyptic number.

It is an amenable number.

221742321 is a deficient number, since it is larger than the sum of its proper divisors (74583279).

221742321 is a wasteful number, since it uses less digits than its factorization.

221742321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167295.

The product of its digits is 1344, while the sum is 24.

The square root of 221742321 is about 14891.0147740172. The cubic root of 221742321 is about 605.2705308343.

Adding to 221742321 its reverse (123247122), we get a palindrome (344989443).

The spelling of 221742321 in words is "two hundred twenty-one million, seven hundred forty-two thousand, three hundred twenty-one".