121213321 has 2 divisors, whose sum is σ = 121213322. Its totient is φ = 121213320.

The previous prime is 121213307. The next prime is 121213333. The reversal of 121213321 is 123312121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 93334921 + 27878400 = 9661^2 + 5280^2 .

It is a cyclic number.

It is not a de Polignac number, because 121213321 - 2⁹ = 121212809 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121213295 and 121213304.

It is not a weakly prime, because it can be changed into another prime (121213021) 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 as a sum of consecutive naturals, namely, 60606660 + 60606661.

It is an arithmetic number, because the mean of its divisors is an integer number (60606661).

Almost surely, 2^121213321 is an apocalyptic number.

It is an amenable number.

121213321 is a deficient number, since it is larger than the sum of its proper divisors (1).

121213321 is an equidigital number, since it uses as much as digits as its factorization.

121213321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72, while the sum is 16.

The square root of 121213321 is about 11009.6921392017. The cubic root of 121213321 is about 494.8992360280.

Adding to 121213321 its reverse (123312121), we get a palindrome (244525442).

The spelling of 121213321 in words is "one hundred twenty-one million, two hundred thirteen thousand, three hundred twenty-one".