221226 has 8 divisors (see below), whose sum is σ = 442464. Its totient is φ = 73740.

The previous prime is 221219. The next prime is 221227. The reversal of 221226 is 622122.

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

221226 is an admirable number.

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (221227) 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, 18430 + ... + 18441.

It is an arithmetic number, because the mean of its divisors is an integer number (55308).

2²²¹²²⁶ is an apocalyptic number.

221226 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221226 is a wasteful number, since it uses less digits than its factorization.

221226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36876.

The product of its digits is 96, while the sum is 15.

The square root of 221226 is about 470.3466806516. The cubic root of 221226 is about 60.4800380378.

Adding to 221226 its reverse (622122), we get a palindrome (843348).

The spelling of 221226 in words is "two hundred twenty-one thousand, two hundred twenty-six".