221204334 has 64 divisors (see below), whose sum is σ = 492065280. Its totient is φ = 65869440.

The previous prime is 221204309. The next prime is 221204339. The reversal of 221204334 is 433402122.

It is a self number, because there is not a number n which added to its sum of digits gives 221204334.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221204339) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 326404 + ... + 327080.

It is an arithmetic number, because the mean of its divisors is an integer number (7688520).

Almost surely, 2^221204334 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221204334, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (246032640).

221204334 is an abundant number, since it is smaller than the sum of its proper divisors (270860946).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221204334 is a wasteful number, since it uses less digits than its factorization.

221204334 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 825.

The product of its (nonzero) digits is 1152, while the sum is 21.

The square root of 221204334 is about 14872.9396556296. The cubic root of 221204334 is about 604.7806358141.

Adding to 221204334 its reverse (433402122), we get a palindrome (654606456).

The spelling of 221204334 in words is "two hundred twenty-one million, two hundred four thousand, three hundred thirty-four".