221231226 has 8 divisors (see below), whose sum is σ = 442462464. Its totient is φ = 73743740.

The previous prime is 221231207. The next prime is 221231233. The reversal of 221231226 is 622132122.

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

221231226 is an admirable number.

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

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18435930 + ... + 18435941.

It is an arithmetic number, because the mean of its divisors is an integer number (55307808).

Almost surely, 2^221231226 is an apocalyptic number.

221231226 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.

221231226 is a wasteful number, since it uses less digits than its factorization.

221231226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36871876.

The product of its digits is 576, while the sum is 21.

The square root of 221231226 is about 14873.8436861492. The cubic root of 221231226 is about 604.8051427207.

Adding to 221231226 its reverse (622132122), we get a palindrome (843363348).

The spelling of 221231226 in words is "two hundred twenty-one million, two hundred thirty-one thousand, two hundred twenty-six".