221330243 has 2 divisors, whose sum is σ = 221330244. Its totient is φ = 221330242.

The previous prime is 221330231. The next prime is 221330251. The reversal of 221330243 is 342033122.

221330243 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221330243 - 2²⁰ = 220281667 is a prime.

It is not a weakly prime, because it can be changed into another prime (221330743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110665121 + 110665122.

It is an arithmetic number, because the mean of its divisors is an integer number (110665122).

Almost surely, 2^221330243 is an apocalyptic number.

221330243 is a deficient number, since it is larger than the sum of its proper divisors (1).

221330243 is an equidigital number, since it uses as much as digits as its factorization.

221330243 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 20.

The square root of 221330243 is about 14877.1718750574. The cubic root of 221330243 is about 604.8953606338.

Adding to 221330243 its reverse (342033122), we get a palindrome (563363365).

The spelling of 221330243 in words is "two hundred twenty-one million, three hundred thirty thousand, two hundred forty-three".