321271916 has 24 divisors (see below), whose sum is σ = 680341536. Its totient is φ = 129588480.

The previous prime is 321271903. The next prime is 321271919. The reversal of 321271916 is 619172123.

It is a super-2 number, since 2×321271916² = 206431288020622112, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (321271919) 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 in 7 ways as a sum of consecutive naturals, for example, 336995 + ... + 337946.

It is an arithmetic number, because the mean of its divisors is an integer number (28347564).

Almost surely, 2^321271916 is an apocalyptic number.

It is an amenable number.

321271916 is an abundant number, since it is smaller than the sum of its proper divisors (359069620).

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

321271916 is a wasteful number, since it uses less digits than its factorization.

321271916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 674969 (or 674967 counting only the distinct ones).

The product of its digits is 4536, while the sum is 32.

The square root of 321271916 is about 17924.0596963969. The cubic root of 321271916 is about 684.8954080455.

It can be divided in two parts, 32127 and 1916, that added together give a palindrome (34043).

The spelling of 321271916 in words is "three hundred twenty-one million, two hundred seventy-one thousand, nine hundred sixteen".