221033312 has 24 divisors (see below), whose sum is σ = 454080816. Its totient is φ = 105711232.

The previous prime is 221033299. The next prime is 221033333. The reversal of 221033312 is 213330122.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 149423 + ... + 150894.

It is an arithmetic number, because the mean of its divisors is an integer number (18920034).

Almost surely, 2^221033312 is an apocalyptic number.

It is an amenable number.

221033312 is an abundant number, since it is smaller than the sum of its proper divisors (233047504).

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

221033312 is a wasteful number, since it uses less digits than its factorization.

221033312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 300350 (or 300342 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 17.

The square root of 221033312 is about 14867.1891089069. The cubic root of 221033312 is about 604.6247355220.

Adding to 221033312 its reverse (213330122), we get a palindrome (434363434).

It can be divided in two parts, 22103 and 3312, that multiplied together give a square (73205136 = 8556²).

The spelling of 221033312 in words is "two hundred twenty-one million, thirty-three thousand, three hundred twelve".