221190289 has 4 divisors (see below), whose sum is σ = 221225956. Its totient is φ = 221154624.

The previous prime is 221190251. The next prime is 221190341. The reversal of 221190289 is 982091122.

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

It can be written as a sum of positive squares in 2 ways, for example, as 8526400 + 212663889 = 2920^2 + 14583^2 .

It is a cyclic number.

It is not a de Polignac number, because 221190289 - 2⁷ = 221190161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221196289) 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 in 3 ways as a sum of consecutive naturals, for example, 5844 + ... + 21829.

It is an arithmetic number, because the mean of its divisors is an integer number (55306489).

Almost surely, 2^221190289 is an apocalyptic number.

It is an amenable number.

221190289 is a deficient number, since it is larger than the sum of its proper divisors (35667).

221190289 is an equidigital number, since it uses as much as digits as its factorization.

221190289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35666.

The product of its (nonzero) digits is 5184, while the sum is 34.

The square root of 221190289 is about 14872.4674818942. The cubic root of 221190289 is about 604.7678356975.

The spelling of 221190289 in words is "two hundred twenty-one million, one hundred ninety thousand, two hundred eighty-nine".