1310232221 has 2 divisors, whose sum is σ = 1310232222. Its totient is φ = 1310232220.

The previous prime is 1310232193. The next prime is 1310232223. The reversal of 1310232221 is 1222320131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1200276025 + 109956196 = 34645^2 + 10486^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1310232221 is a prime.

It is a Sophie Germain prime.

Together with 1310232223, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1310232221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1310232223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 655116110 + 655116111.

It is an arithmetic number, because the mean of its divisors is an integer number (655116111).

Almost surely, 2^1310232221 is an apocalyptic number.

It is an amenable number.

1310232221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1310232221 is an equidigital number, since it uses as much as digits as its factorization.

1310232221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 1310232221 is about 36197.1300105409. The cubic root of 1310232221 is about 1094.2488321351.

Adding to 1310232221 its reverse (1222320131), we get a palindrome (2532552352).

The spelling of 1310232221 in words is "one billion, three hundred ten million, two hundred thirty-two thousand, two hundred twenty-one".