221312320321012 has 12 divisors (see below), whose sum is σ = 387299060479296. Its totient is φ = 110655445898360.

The previous prime is 221312320320983. The next prime is 221312320321033. The reversal of 221312320321012 is 210123023213122.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 177868078 + ... + 179108005.

It is an arithmetic number, because the mean of its divisors is an integer number (32274921706608).

Almost surely, 2^{221312320321012} is an apocalyptic number.

It is an amenable number.

221312320321012 is a deficient number, since it is larger than the sum of its proper divisors (165986740158284).

221312320321012 is a wasteful number, since it uses less digits than its factorization.

221312320321012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 357131078 (or 357131076 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 25.

Adding to 221312320321012 its reverse (210123023213122), we get a palindrome (431435343534134).

The spelling of 221312320321012 in words is "two hundred twenty-one trillion, three hundred twelve billion, three hundred twenty million, three hundred twenty-one thousand, twelve".