221121226 has 4 divisors (see below), whose sum is σ = 331681842. Its totient is φ = 110560612.

The previous prime is 221121223. The next prime is 221121253. The reversal of 221121226 is 622121122.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 214593201 + 6528025 = 14649^2 + 2555^2 .

It is not an unprimeable number, because it can be changed into a prime (221121223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55280305 + ... + 55280308.

Almost surely, 2^221121226 is an apocalyptic number.

221121226 is a deficient number, since it is larger than the sum of its proper divisors (110560616).

221121226 is a wasteful number, since it uses less digits than its factorization.

221121226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110560615.

The product of its digits is 192, while the sum is 19.

The square root of 221121226 is about 14870.1454599476. The cubic root of 221121226 is about 604.7048862359.

Adding to 221121226 its reverse (622121122), we get a palindrome (843242348).

The spelling of 221121226 in words is "two hundred twenty-one million, one hundred twenty-one thousand, two hundred twenty-six".