221003312 has 10 divisors (see below), whose sum is σ = 428193948. Its totient is φ = 110501648.

The previous prime is 221003303. The next prime is 221003317. The reversal of 221003312 is 213300122.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (221003317) by changing a digit.

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 as a sum of consecutive naturals, namely, 6906338 + ... + 6906369.

Almost surely, 2^221003312 is an apocalyptic number.

It is an amenable number.

221003312 is a deficient number, since it is larger than the sum of its proper divisors (207190636).

221003312 is a wasteful number, since it uses less digits than its factorization.

221003312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13812715 (or 13812709 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 221003312 is about 14866.1801415158. The cubic root of 221003312 is about 604.5973798222.

Adding to 221003312 its reverse (213300122), we get a palindrome (434303434).

The spelling of 221003312 in words is "two hundred twenty-one million, three thousand, three hundred twelve".