321516221011 has 24 divisors (see below), whose sum is σ = 359751203280. Its totient is φ = 286308435456.

The previous prime is 321516220979. The next prime is 321516221051. The reversal of 321516221011 is 110122615123.

It is not a de Polignac number, because 321516221011 - 2⁵ = 321516220979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (321516221051) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4796535 + ... + 4863103.

It is an arithmetic number, because the mean of its divisors is an integer number (14989633470).

Almost surely, 2^321516221011 is an apocalyptic number.

321516221011 is a deficient number, since it is larger than the sum of its proper divisors (38234982269).

321516221011 is a wasteful number, since it uses less digits than its factorization.

321516221011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67411 (or 67392 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 25.

Adding to 321516221011 its reverse (110122615123), we get a palindrome (431638836134).

The spelling of 321516221011 in words is "three hundred twenty-one billion, five hundred sixteen million, two hundred twenty-one thousand, eleven".