121321 has 2 divisors, whose sum is σ = 121322. Its totient is φ = 121320.

The previous prime is 121313. The next prime is 121327. The reversal of 121321 is 123121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 114921 + 6400 = 339^2 + 80^2 .

It is an emirp because it is prime and its reverse (123121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121321 - 2³ = 121313 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121298 and 121307.

It is not a weakly prime, because it can be changed into another prime (121327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60660 + 60661.

It is an arithmetic number, because the mean of its divisors is an integer number (60661).

2¹²¹³²¹ is an apocalyptic number.

It is an amenable number.

121321 is a deficient number, since it is larger than the sum of its proper divisors (1).

121321 is an equidigital number, since it uses as much as digits as its factorization.

121321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12, while the sum is 10.

The square root of 121321 is about 348.3116420678. The cubic root of 121321 is about 49.5045739405.

Adding to 121321 its reverse (123121), we get a palindrome (244442).

The spelling of 121321 in words is "one hundred twenty-one thousand, three hundred twenty-one", and thus it is an iban number.