221340043 has 2 divisors, whose sum is σ = 221340044. Its totient is φ = 221340042.

The previous prime is 221340029. The next prime is 221340059. The reversal of 221340043 is 340043122.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221340043 - 2¹⁷ = 221208971 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221340043.

It is not a weakly prime, because it can be changed into another prime (221340143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110670021 + 110670022.

It is an arithmetic number, because the mean of its divisors is an integer number (110670022).

Almost surely, 2^221340043 is an apocalyptic number.

221340043 is a deficient number, since it is larger than the sum of its proper divisors (1).

221340043 is an equidigital number, since it uses as much as digits as its factorization.

221340043 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 221340043 is about 14877.5012350865. The cubic root of 221340043 is about 604.9042882992.

Adding to 221340043 its reverse (340043122), we get a palindrome (561383165).

The spelling of 221340043 in words is "two hundred twenty-one million, three hundred forty thousand, forty-three".