1221221022041 has 2 divisors, whose sum is σ = 1221221022042. Its totient is φ = 1221221022040.

The previous prime is 1221221022029. The next prime is 1221221022061. The reversal of 1221221022041 is 1402201221221.

It is a happy number.

It is an a-pointer prime, because the next prime (1221221022061) can be obtained adding 1221221022041 to its sum of digits (20).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1176866977225 + 44354044816 = 1084835^2 + 210604^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221221022041 - 2¹⁸ = 1221220759897 is a prime.

It is not a weakly prime, because it can be changed into another prime (1221221022061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610610511020 + 610610511021.

It is an arithmetic number, because the mean of its divisors is an integer number (610610511021).

Almost surely, 2^{1221221022041} is an apocalyptic number.

It is an amenable number.

1221221022041 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221221022041 is an equidigital number, since it uses as much as digits as its factorization.

1221221022041 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 1221221022041 its reverse (1402201221221), we get a palindrome (2623422243262).

The spelling of 1221221022041 in words is "one trillion, two hundred twenty-one billion, two hundred twenty-one million, twenty-two thousand, forty-one".