321516221012 has 12 divisors (see below), whose sum is σ = 643032442080. Its totient is φ = 137792666136.

The previous prime is 321516220979. The next prime is 321516221051. The reversal of 321516221012 is 210122615123.

321516221012 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5741361062 + ... + 5741361117.

It is an arithmetic number, because the mean of its divisors is an integer number (53586036840).

Almost surely, 2^321516221012 is an apocalyptic number.

It is an amenable number.

321516221012 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

321516221012 is a wasteful number, since it uses less digits than its factorization.

321516221012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11482722190 (or 11482722188 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 26.

Adding to 321516221012 its reverse (210122615123), we get a palindrome (531638836135).

The spelling of 321516221012 in words is "three hundred twenty-one billion, five hundred sixteen million, two hundred twenty-one thousand, twelve".