221304243 has 8 divisors (see below), whose sum is σ = 296195328. Its totient is φ = 146974664.

The previous prime is 221304211. The next prime is 221304253. The reversal of 221304243 is 342403122.

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 221304243 - 2⁵ = 221304211 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221304253) 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, 139455 + ... + 141032.

It is an arithmetic number, because the mean of its divisors is an integer number (37024416).

Almost surely, 2^221304243 is an apocalyptic number.

221304243 is a deficient number, since it is larger than the sum of its proper divisors (74891085).

221304243 is a wasteful number, since it uses less digits than its factorization.

221304243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280753.

The product of its (nonzero) digits is 1152, while the sum is 21.

The square root of 221304243 is about 14876.2980273992. The cubic root of 221304243 is about 604.8716737139.

Adding to 221304243 its reverse (342403122), we get a palindrome (563707365).

The spelling of 221304243 in words is "two hundred twenty-one million, three hundred four thousand, two hundred forty-three".