221502243 has 4 divisors (see below), whose sum is σ = 295336328. Its totient is φ = 147668160.

The previous prime is 221502241. The next prime is 221502257. The reversal of 221502243 is 342205122.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 221502243 - 2¹ = 221502241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221502241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36917038 + ... + 36917043.

It is an arithmetic number, because the mean of its divisors is an integer number (73834082).

Almost surely, 2^221502243 is an apocalyptic number.

221502243 is a deficient number, since it is larger than the sum of its proper divisors (73834085).

221502243 is an equidigital number, since it uses as much as digits as its factorization.

221502243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73834084.

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 221502243 is about 14882.9514210052. The cubic root of 221502243 is about 605.0520120118.

Adding to 221502243 its reverse (342205122), we get a palindrome (563707365).

The spelling of 221502243 in words is "two hundred twenty-one million, five hundred two thousand, two hundred forty-three".