321711121 has 4 divisors (see below), whose sum is σ = 323378212. Its totient is φ = 320044032.

The previous prime is 321711109. The next prime is 321711197. The reversal of 321711121 is 121117123.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 79566400 + 242144721 = 8920^2 + 15561^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-321711121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (321712121) 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 3 ways as a sum of consecutive naturals, for example, 833256 + ... + 833641.

It is an arithmetic number, because the mean of its divisors is an integer number (80844553).

Almost surely, 2^321711121 is an apocalyptic number.

It is an amenable number.

321711121 is a deficient number, since it is larger than the sum of its proper divisors (1667091).

321711121 is a wasteful number, since it uses less digits than its factorization.

321711121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1667090.

The product of its digits is 84, while the sum is 19.

The square root of 321711121 is about 17936.3073401411. The cubic root of 321711121 is about 685.2073686202.

Adding to 321711121 its reverse (121117123), we get a palindrome (442828244).

The spelling of 321711121 in words is "three hundred twenty-one million, seven hundred eleven thousand, one hundred twenty-one".