221449 has 4 divisors (see below), whose sum is σ = 224640. Its totient is φ = 218260.

The previous prime is 221447. The next prime is 221453. The reversal of 221449 is 944122.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 221449 - 2¹ = 221447 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1489 + ... + 1630.

It is an arithmetic number, because the mean of its divisors is an integer number (56160).

2²²¹⁴⁴⁹ is an apocalyptic number.

It is an amenable number.

221449 is a deficient number, since it is larger than the sum of its proper divisors (3191).

221449 is an equidigital number, since it uses as much as digits as its factorization.

221449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3190.

The product of its digits is 576, while the sum is 22.

The square root of 221449 is about 470.5836801250. The cubic root of 221449 is about 60.5003528882.

It can be divided in two parts, 22 and 1449, that multiplied together give a triangular number (31878 = T₂₅₂).

The spelling of 221449 in words is "two hundred twenty-one thousand, four hundred forty-nine".