221211330 has 16 divisors (see below), whose sum is σ = 530907264. Its totient is φ = 58989680.

The previous prime is 221211269. The next prime is 221211379. The reversal of 221211330 is 33112122.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3686826 + ... + 3686885.

It is an arithmetic number, because the mean of its divisors is an integer number (33181704).

Almost surely, 2^221211330 is an apocalyptic number.

221211330 is an abundant number, since it is smaller than the sum of its proper divisors (309695934).

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

221211330 is a wasteful number, since it uses less digits than its factorization.

221211330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7373721.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 221211330 is about 14873.1748460105. The cubic root of 221211330 is about 604.7870115191.

Adding to 221211330 its reverse (33112122), we get a palindrome (254323452).

The spelling of 221211330 in words is "two hundred twenty-one million, two hundred eleven thousand, three hundred thirty".