221443289 has 2 divisors, whose sum is σ = 221443290. Its totient is φ = 221443288.

The previous prime is 221443171. The next prime is 221443291. The reversal of 221443289 is 982344122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 170563600 + 50879689 = 13060^2 + 7133^2 .

It is a cyclic number.

It is not a de Polignac number, because 221443289 - 2²⁴ = 204666073 is a prime.

Together with 221443291, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (221443489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110721644 + 110721645.

It is an arithmetic number, because the mean of its divisors is an integer number (110721645).

Almost surely, 2^221443289 is an apocalyptic number.

It is an amenable number.

221443289 is a deficient number, since it is larger than the sum of its proper divisors (1).

221443289 is an equidigital number, since it uses as much as digits as its factorization.

221443289 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27648, while the sum is 35.

The square root of 221443289 is about 14880.9707008649. The cubic root of 221443289 is about 604.9983279784.

The spelling of 221443289 in words is "two hundred twenty-one million, four hundred forty-three thousand, two hundred eighty-nine".