321016121 has 2 divisors, whose sum is σ = 321016122. Its totient is φ = 321016120.

The previous prime is 321016103. The next prime is 321016123. The reversal of 321016121 is 121610123.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 214183225 + 106832896 = 14635^2 + 10336^2 .

It is an emirp because it is prime and its reverse (121610123) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-321016121 is a prime.

Together with 321016123, it forms a pair of twin primes.

It is a Chen prime.

It is an alternating number because its digits alternate between odd and even.

It is a self number, because there is not a number n which added to its sum of digits gives 321016121.

It is not a weakly prime, because it can be changed into another prime (321016123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160508060 + 160508061.

It is an arithmetic number, because the mean of its divisors is an integer number (160508061).

Almost surely, 2^321016121 is an apocalyptic number.

It is an amenable number.

321016121 is a deficient number, since it is larger than the sum of its proper divisors (1).

321016121 is an equidigital number, since it uses as much as digits as its factorization.

321016121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 321016121 is about 17916.9227547590. The cubic root of 321016121 is about 684.7135897492.

Adding to 321016121 its reverse (121610123), we get a palindrome (442626244).

The spelling of 321016121 in words is "three hundred twenty-one million, sixteen thousand, one hundred twenty-one".