221330212 has 24 divisors (see below), whose sum is σ = 394642080. Its totient is φ = 108588480.

The previous prime is 221330201. The next prime is 221330231. The reversal of 221330212 is 212033122.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 73839 + ... + 76777.

It is an arithmetic number, because the mean of its divisors is an integer number (16443420).

Almost surely, 2^221330212 is an apocalyptic number.

It is an amenable number.

221330212 is a deficient number, since it is larger than the sum of its proper divisors (173311868).

221330212 is a wasteful number, since it uses less digits than its factorization.

221330212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3291 (or 3289 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 221330212 is about 14877.1708331927. The cubic root of 221330212 is about 604.8953323928.

Adding to 221330212 its reverse (212033122), we get a palindrome (433363334).

The spelling of 221330212 in words is "two hundred twenty-one million, three hundred thirty thousand, two hundred twelve".