221034330 has 72 divisors (see below), whose sum is σ = 631714356. Its totient is φ = 53581440.

The previous prime is 221034329. The next prime is 221034349. The reversal of 221034330 is 33430122.

It can be written as a sum of positive squares in 2 ways, for example, as 219543489 + 1490841 = 14817^2 + 1221^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 742 + ... + 21038.

Almost surely, 2^221034330 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221034330, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (315857178).

221034330 is an abundant number, since it is smaller than the sum of its proper divisors (410680026).

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

221034330 is a wasteful number, since it uses less digits than its factorization.

221034330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20332 (or 20318 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 18.

The square root of 221034330 is about 14867.2233453325. The cubic root of 221034330 is about 604.6256637487.

Adding to 221034330 its reverse (33430122), we get a palindrome (254464452).

The spelling of 221034330 in words is "two hundred twenty-one million, thirty-four thousand, three hundred thirty".