221213234 has 16 divisors (see below), whose sum is σ = 362244960. Its totient is φ = 100479360.

The previous prime is 221213233. The next prime is 221213261. The reversal of 221213234 is 432312122.

221213234 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (221213233) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38897 + ... + 44219.

It is an arithmetic number, because the mean of its divisors is an integer number (22640310).

Almost surely, 2^221213234 is an apocalyptic number.

221213234 is a deficient number, since it is larger than the sum of its proper divisors (141031726).

221213234 is a wasteful number, since it uses less digits than its factorization.

221213234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7225.

The product of its digits is 576, while the sum is 20.

The square root of 221213234 is about 14873.2388537265. The cubic root of 221213234 is about 604.7887466791.

Adding to 221213234 its reverse (432312122), we get a palindrome (653525356).

The spelling of 221213234 in words is "two hundred twenty-one million, two hundred thirteen thousand, two hundred thirty-four".