1101221775221 has 2 divisors, whose sum is σ = 1101221775222. Its totient is φ = 1101221775220.

The previous prime is 1101221775187. The next prime is 1101221775229. The reversal of 1101221775221 is 1225771221011.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 819006900100 + 282214875121 = 904990^2 + 531239^2 .

It is a cyclic number.

It is not a de Polignac number, because 1101221775221 - 2¹⁴ = 1101221758837 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1101221775229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 550610887610 + 550610887611.

It is an arithmetic number, because the mean of its divisors is an integer number (550610887611).

Almost surely, 2^{1101221775221} is an apocalyptic number.

It is an amenable number.

1101221775221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1101221775221 is an equidigital number, since it uses as much as digits as its factorization.

1101221775221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3920, while the sum is 32.

Adding to 1101221775221 its reverse (1225771221011), we get a palindrome (2326992996232).

The spelling of 1101221775221 in words is "one trillion, one hundred one billion, two hundred twenty-one million, seven hundred seventy-five thousand, two hundred twenty-one".