1324121221 has 2 divisors, whose sum is σ = 1324121222. Its totient is φ = 1324121220.

The previous prime is 1324121219. The next prime is 1324121233. The reversal of 1324121221 is 1221214231.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 664350625 + 659770596 = 25775^2 + 25686^2 .

It is a cyclic number.

It is not a de Polignac number, because 1324121221 - 2¹ = 1324121219 is a prime.

It is a super-3 number, since 3×1324121221³ (a number of 28 digits) contains 333 as substring.

Together with 1324121219, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1324121621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 662060610 + 662060611.

It is an arithmetic number, because the mean of its divisors is an integer number (662060611).

Almost surely, 2^1324121221 is an apocalyptic number.

It is an amenable number.

1324121221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1324121221 is an equidigital number, since it uses as much as digits as its factorization.

1324121221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 192, while the sum is 19.

The square root of 1324121221 is about 36388.4764863823. The cubic root of 1324121221 is about 1098.1017456530.

Adding to 1324121221 its reverse (1221214231), we get a palindrome (2545335452).

The spelling of 1324121221 in words is "one billion, three hundred twenty-four million, one hundred twenty-one thousand, two hundred twenty-one".