321516221044 has 12 divisors (see below), whose sum is σ = 562657487364. Its totient is φ = 160756938944.

The previous prime is 321516220979. The next prime is 321516221051. The reversal of 321516221044 is 440122615123.

It can be written as a sum of positive squares in 2 ways, for example, as 75289872100 + 246226348944 = 274390^2 + 496212^2 .

It is a junction number, because it is equal to n+sod(n) for n = 321516220997 and 321516221015.

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, 694194 + ... + 1060630.

It is an arithmetic number, because the mean of its divisors is an integer number (46888123947).

Almost surely, 2^321516221044 is an apocalyptic number.

It is an amenable number.

321516221044 is a deficient number, since it is larger than the sum of its proper divisors (241141266320).

321516221044 is a wasteful number, since it uses less digits than its factorization.

321516221044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 585794 (or 585792 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 31.

Adding to 321516221044 its reverse (440122615123), we get a palindrome (761638836167).

The spelling of 321516221044 in words is "three hundred twenty-one billion, five hundred sixteen million, two hundred twenty-one thousand, forty-four".