321646121 has 2 divisors, whose sum is σ = 321646122. Its totient is φ = 321646120.

The previous prime is 321646097. The next prime is 321646147. The reversal of 321646121 is 121646123.

It is an a-pointer prime, because the next prime (321646147) can be obtained adding 321646121 to its sum of digits (26).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 320947225 + 698896 = 17915^2 + 836^2 .

It is an emirp because it is prime and its reverse (121646123) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 321646121 - 2²² = 317451817 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (321646181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160823060 + 160823061.

It is an arithmetic number, because the mean of its divisors is an integer number (160823061).

Almost surely, 2^321646121 is an apocalyptic number.

It is an amenable number.

321646121 is a deficient number, since it is larger than the sum of its proper divisors (1).

321646121 is an equidigital number, since it uses as much as digits as its factorization.

321646121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1728, while the sum is 26.

The square root of 321646121 is about 17934.4952814402. The cubic root of 321646121 is about 685.1612180253.

The spelling of 321646121 in words is "three hundred twenty-one million, six hundred forty-six thousand, one hundred twenty-one".