221124289 has 2 divisors, whose sum is σ = 221124290. Its totient is φ = 221124288.

The previous prime is 221124283. The next prime is 221124307. The reversal of 221124289 is 982421122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 120824064 + 100300225 = 10992^2 + 10015^2 .

It is a cyclic number.

It is not a de Polignac number, because 221124289 - 2⁵ = 221124257 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221124289.

It is not a weakly prime, because it can be changed into another prime (221124283) 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, 110562144 + 110562145.

It is an arithmetic number, because the mean of its divisors is an integer number (110562145).

Almost surely, 2^221124289 is an apocalyptic number.

It is an amenable number.

221124289 is a deficient number, since it is larger than the sum of its proper divisors (1).

221124289 is an equidigital number, since it uses as much as digits as its factorization.

221124289 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4608, while the sum is 31.

The square root of 221124289 is about 14870.2484511860. The cubic root of 221124289 is about 604.7076783733.

The spelling of 221124289 in words is "two hundred twenty-one million, one hundred twenty-four thousand, two hundred eighty-nine".