1221021304241 has 2 divisors, whose sum is σ = 1221021304242. Its totient is φ = 1221021304240.

The previous prime is 1221021304231. The next prime is 1221021304309. The reversal of 1221021304241 is 1424031201221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 917580073216 + 303441231025 = 957904^2 + 550855^2 .

It is an emirp because it is prime and its reverse (1424031201221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1221021304241 - 2²² = 1221017109937 is a prime.

It is not a weakly prime, because it can be changed into another prime (1221021304231) 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, 610510652120 + 610510652121.

It is an arithmetic number, because the mean of its divisors is an integer number (610510652121).

Almost surely, 2^{1221021304241} is an apocalyptic number.

It is an amenable number.

1221021304241 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221021304241 is an equidigital number, since it uses as much as digits as its factorization.

1221021304241 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 768, while the sum is 23.

Adding to 1221021304241 its reverse (1424031201221), we get a palindrome (2645052505462).

The spelling of 1221021304241 in words is "one trillion, two hundred twenty-one billion, twenty-one million, three hundred four thousand, two hundred forty-one".