221446 has 8 divisors (see below), whose sum is σ = 334224. Its totient is φ = 110040.

The previous prime is 221413. The next prime is 221447. The reversal of 221446 is 644122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a pancake number, because a pancake can be divided into 221446 parts by 665 straight cuts.

It is a congruent 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, 316 + ... + 736.

It is an arithmetic number, because the mean of its divisors is an integer number (41778).

2²²¹⁴⁴⁶ is an apocalyptic number.

221446 is a deficient number, since it is larger than the sum of its proper divisors (112778).

221446 is a wasteful number, since it uses less digits than its factorization.

221446 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 686.

The product of its digits is 384, while the sum is 19.

The square root of 221446 is about 470.5804925834. The cubic root of 221446 is about 60.5000796848.

Adding to 221446 its reverse (644122), we get a palindrome (865568).

The spelling of 221446 in words is "two hundred twenty-one thousand, four hundred forty-six".