221730422 has 16 divisors (see below), whose sum is σ = 353723760. Its totient is φ = 103880448.

The previous prime is 221730391. The next prime is 221730463. The reversal of 221730422 is 224037122.

It is a happy number.

221730422 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-3 number, since 3×221730422³ (a number of 26 digits) contains 333 as substring.

It is a congruent 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 7 ways as a sum of consecutive naturals, for example, 6647 + ... + 22082.

It is an arithmetic number, because the mean of its divisors is an integer number (22107735).

Almost surely, 2^221730422 is an apocalyptic number.

221730422 is a deficient number, since it is larger than the sum of its proper divisors (131993338).

221730422 is a wasteful number, since it uses less digits than its factorization.

221730422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28975.

The product of its (nonzero) digits is 1344, while the sum is 23.

The square root of 221730422 is about 14890.6152324207. The cubic root of 221730422 is about 605.2597040891.

Adding to 221730422 its reverse (224037122), we get a palindrome (445767544).

The spelling of 221730422 in words is "two hundred twenty-one million, seven hundred thirty thousand, four hundred twenty-two".