1211332321 has 2 divisors, whose sum is σ = 1211332322. Its totient is φ = 1211332320.

The previous prime is 1211332301. The next prime is 1211332361. The reversal of 1211332321 is 1232331121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 679384225 + 531948096 = 26065^2 + 23064^2 .

It is a cyclic number.

It is not a de Polignac number, because 1211332321 - 2¹¹ = 1211330273 is a prime.

It is not a weakly prime, because it can be changed into another prime (1211332301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605666160 + 605666161.

It is an arithmetic number, because the mean of its divisors is an integer number (605666161).

Almost surely, 2^1211332321 is an apocalyptic number.

It is an amenable number.

1211332321 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211332321 is an equidigital number, since it uses as much as digits as its factorization.

1211332321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 216, while the sum is 19.

The square root of 1211332321 is about 34804.1997609484. The cubic root of 1211332321 is about 1065.9932019110.

Adding to 1211332321 its reverse (1232331121), we get a palindrome (2443663442).

The spelling of 1211332321 in words is "one billion, two hundred eleven million, three hundred thirty-two thousand, three hundred twenty-one".