1221101220041 has 2 divisors, whose sum is σ = 1221101220042. Its totient is φ = 1221101220040.

The previous prime is 1221101220037. The next prime is 1221101220071. The reversal of 1221101220041 is 1400221011221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 961633235641 + 259467984400 = 980629^2 + 509380^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221101220041 - 2² = 1221101220037 is a prime.

It is not a weakly prime, because it can be changed into another prime (1221101220011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610550610020 + 610550610021.

It is an arithmetic number, because the mean of its divisors is an integer number (610550610021).

Almost surely, 2^{1221101220041} is an apocalyptic number.

It is an amenable number.

1221101220041 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221101220041 is an equidigital number, since it uses as much as digits as its factorization.

1221101220041 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 1221101220041 its reverse (1400221011221), we get a palindrome (2621322231262).

The spelling of 1221101220041 in words is "one trillion, two hundred twenty-one billion, one hundred one million, two hundred twenty thousand, forty-one".