1212541321 has 2 divisors, whose sum is σ = 1212541322. Its totient is φ = 1212541320.

The previous prime is 1212541279. The next prime is 1212541349. The reversal of 1212541321 is 1231452121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 672676096 + 539865225 = 25936^2 + 23235^2 .

It is an emirp because it is prime and its reverse (1231452121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1212541321 - 2⁷ = 1212541193 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1212541292 and 1212541301.

It is not a weakly prime, because it can be changed into another prime (1212541381) 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, 606270660 + 606270661.

It is an arithmetic number, because the mean of its divisors is an integer number (606270661).

Almost surely, 2^1212541321 is an apocalyptic number.

It is an amenable number.

1212541321 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212541321 is an equidigital number, since it uses as much as digits as its factorization.

1212541321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 480, while the sum is 22.

The square root of 1212541321 is about 34821.5640228867. The cubic root of 1212541321 is about 1066.3477308948.

Adding to 1212541321 its reverse (1231452121), we get a palindrome (2443993442).

The spelling of 1212541321 in words is "one billion, two hundred twelve million, five hundred forty-one thousand, three hundred twenty-one".