221404234 has 4 divisors (see below), whose sum is σ = 332106354. Its totient is φ = 110702116.

The previous prime is 221404231. The next prime is 221404237. The reversal of 221404234 is 432404122.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (221404231) and next prime (221404237).

It can be written as a sum of positive squares in only one way, i.e., 185368225 + 36036009 = 13615^2 + 6003^2 .

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (221404231) 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, 55351057 + ... + 55351060.

Almost surely, 2^221404234 is an apocalyptic number.

221404234 is a deficient number, since it is larger than the sum of its proper divisors (110702120).

221404234 is a wasteful number, since it uses less digits than its factorization.

221404234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110702119.

The product of its (nonzero) digits is 1536, while the sum is 22.

The square root of 221404234 is about 14879.6583966165. The cubic root of 221404234 is about 604.9627589034.

Adding to 221404234 its reverse (432404122), we get a palindrome (653808356).

The spelling of 221404234 in words is "two hundred twenty-one million, four hundred four thousand, two hundred thirty-four".