1221310241 has 2 divisors, whose sum is σ = 1221310242. Its totient is φ = 1221310240.

The previous prime is 1221310199. The next prime is 1221310247. The reversal of 1221310241 is 1420131221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 735548641 + 485761600 = 27121^2 + 22040^2 .

It is an emirp because it is prime and its reverse (1420131221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1221310241 - 2¹⁸ = 1221048097 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1221310247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610655120 + 610655121.

It is an arithmetic number, because the mean of its divisors is an integer number (610655121).

Almost surely, 2^1221310241 is an apocalyptic number.

It is an amenable number.

1221310241 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221310241 is an equidigital number, since it uses as much as digits as its factorization.

1221310241 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 1221310241 is about 34947.2494053538. The cubic root of 1221310241 is about 1068.9121155491.

Adding to 1221310241 its reverse (1420131221), we get a palindrome (2641441462).

The spelling of 1221310241 in words is "one billion, two hundred twenty-one million, three hundred ten thousand, two hundred forty-one".