221343330 has 64 divisors (see below), whose sum is σ = 578083968. Its totient is φ = 53913600.

The previous prime is 221343313. The next prime is 221343337. The reversal of 221343330 is 33343122.

221343330 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 221343297 and 221343306.

It is not an unprimeable number, because it can be changed into a prime (221343337) 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, 34905 + ... + 40755.

It is an arithmetic number, because the mean of its divisors is an integer number (9032562).

Almost surely, 2^221343330 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221343330, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (289041984).

221343330 is an abundant number, since it is smaller than the sum of its proper divisors (356740638).

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

221343330 is a wasteful number, since it uses less digits than its factorization.

221343330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5971.

The product of its (nonzero) digits is 1296, while the sum is 21.

The square root of 221343330 is about 14877.6117034960. The cubic root of 221343330 is about 604.9072826520.

Adding to 221343330 its reverse (33343122), we get a palindrome (254686452).

The spelling of 221343330 in words is "two hundred twenty-one million, three hundred forty-three thousand, three hundred thirty".